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IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

Mecanismos

Mecanismos e Máquinas:

Grau de Liberdade

Prof. Paulo Boni

Aula II

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

Conteúdo

• Definição de cadeia cinemática

• Cálculo do grau de liberdade de

um mecanismo

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

Junta ou Par cinemático

Par de superfícies mantidas permanentemente em contato

de tal forma a produzir um movimento relativo bem

definido entre elas.

Pode ser:

• inferior: o contato é uma superfície

• superior: o contato é uma reta ou um ponto

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

Junta ou Par cinemático

Par cinemático inferior: o contato é uma superfície

Rotativo Deslizante

Superfície 1

(externa do

pino)

Superfície 2

(interna do furo)

Superfície 1

(interna do furo)

Superfície 2

(externa do prisma)

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

Junta ou Par cinemático

Par cinemático superior: o contato é um ponto ou

uma linha

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni 6

Junta ou

Par

cinemático

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

Mobilidade

Representa a soma dos movimentos possíveis em

cada “direção”.

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

Mobilidade (Grau de Liberdade)

Representa a soma dos movimentos possíveis em

cada “direção”.

No plano: M=3 No espaço tridimensional: M=6

x

y

xy

z

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni 22/03/2013 9

Elo (link)

Corpo rígido com dois ou mais pares cinemáticos,

através dos quais se pode conectar outros corpos

Binário Ternário Quaternário

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

Cadeia cinemática

Sistema resultante da conexão de vários elos formando um

circuito ou malha e que ainda pode produzir movimento.

Cadeia cinemática aberta Cadeia cinemática fechada

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

Mecanismo de cadeia cinemática

simples

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

Mecanismo de cadeia cinemática

composta

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

Grafo de uma cadeia cinemática

Polígono composto por vértices e arestas, que representa a

conectividade da cadeia cinemática.

Vértices Elos - Números

Arestas Pares cinemáticos - Letras

1

2

3 4

5

d

c

b

a

1

6

e f

g

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

Exemplo 1

Bomba de petróleo

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

Exemplo 1

1-Identificação dos elos

números

1

2

3

4

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

Exemplo 1

1-Identificação dos elos

2-Identificação dos pares cinemáticos

letras

d

1

2

3

4

a

b

c

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

Exemplo 1

3

4 1

2

1-Identificação dos elos

2-Identificação dos pares cinemáticos

3-Definição dos vértices

elos

d

1

2

3

4

a

b

c

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

Exemplo 1

3

4 1

2

d

a

b

c

1-Identificação dos elos

2-Identificação dos pares cinemáticos

3-Definição dos vértices

4-Definição das arestas

juntas (pares cinemáticos)

d

1

2

3

4

a

b

c

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni 19

Inversão

Fixando-se cada um dos elos tem-se um mecanismo diferente (inversão)

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni 20

Inversão

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

Inversão

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni 22

Graus de liberdade (F) de um mecanismo

é o número de parâmetros independentes que são

necessários para se definir a posição de um corpo

noespaço em qualquer instante.

Critério de Gruebler e Kutzbach: M = 3.(N - 1) – 2P1 – P2

M – número de graus de liberdade do mecanismo

N – número total de elos do mecanismo (incluindo o solo)

P1 – número de pares cinemáticos com 1 g.l.

P2 – número de pares cinemáticos com 2 g.l.

Casos:

a) M = 0 Estrutura

b) M > 0 Mecanismo

c) M < 0 Sistema Hiperestático

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

M=1 M=2

Graus de liberdade

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

Example

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

Meia Junta

Junta Múltipla –Três - Elos Ligados P1 = 2

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

2.7 Paradoxes

• Greubler criterion does not include geometry, so it

can give wrong prediction

• We must use inspection

E-quintet

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

2.5 Mechanisms and Structures

• Mechanism: DOF>0

• Structure: DOF=0

• Preloaded Structure –

DOF<0, may require

force to assemble

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

Exemplos

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

Exemplos

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

Exemplos

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

Exemplos

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

Exemplos

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

Exemplos

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

Exemplos

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

Exemplos

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

Exemplos

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni 22/03/2013 37

Graus de liberdade (F) de um mecanismo

Exemplo 2:

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

Graus de liberdade (F) de um mecanismo

Exemplo 3:

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

Graus de liberdade (F) de um mecanismo

Exemplo 4:

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

Graus de liberdade (F) de um mecanismo

Exemplo 5:

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

Exercícios

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni 22/03/2013 42

Exercício 1

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

Exercício 4

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

Exercício 5

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni 22/03/2013 45

Exercício 7

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni 46

Exercício 8

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni 47

Exercício 9

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni 22/03/2013 48

Exercício 10

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

IFSC Paulo Boni IFSC Paulo

Boni IFSC Paulo Boni IFSC

Paulo Boni IFSC Paulo Boni

Comparar

Exercício 11

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