presentation projecto maquinas 1

7/27/2019 Presentation Projecto Maquinas 1

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Machine Component Design Project


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Agenda

Overview

Design Objectives

Process Flowchart

Data Analysis

Material Selection

Design Proposal


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Overview

Our design labor consist in the design process of a V-belt speed

reduction shaft for a given mechanism with fixed forces andtorque. The model consist of two rotating pulleys with different

diameters connected to a shaft linkage.


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Shaft Design

Defining Problem

Design objectives

Static Analysis

Defining forces

and reaction Shear and

momentumdiagrams

Critical Point

Stress analysis

Safety factor

selection Material Selection

Informationresearch

Solve for optimalDiameter

DesignProposal


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Design Objectives

Construct a shaft with a safety diameter

that can handle the forces created by

the rotating belt tension

Choose a material that is both reliableand economic viable

Build a design that can be easily

manufacturedAccomplish with all the standards of

good engineering practice


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Static Analysis

The forces in the space are divided in to

two different plane components, plane

XY, and plane XZ

The analysis will be consider at thesurface point in the shaft critical point.

Gravitational forces are neglected


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Static Analysis

Pulley B

Pulley D


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Static Analysis

Point C

Point A


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Static Analysis

Forces in Plane XZ

Forces in Plane YZ

2552.18 N 2262.36 N

371.147 N 4443.367 N

3580.43 N 374.31 N

1640.49 N 2314.259 N


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Static Analysis

Shear through the shaft in the plane XZ

Shear through the shaft in the plane YZ


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Static Analysis

Momentum through the shaft in the plane XZ

Momentum through the shaft in the plane YZ


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Static Analysis

0

20

40

60

80

100

120

140

160

0 50 100 150 200 250

Axis Title

Momentum

Critical Point136.59 N-m


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Static Analysis

-300

-250

-200

-150

-100

-50

0

0 50 100 150 200 250

Torque(N-m

)

Shaft Length (m)

254.5 N-m


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Data Analysis

We selected a Safety factor of 2.5

because it is a dynamic system that will

be under cyclic stresses.

We assumed the step on the shaftbetween pulley b and bearing C to have

a diameter of 40 mm.


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point B stress Analysis: d1

Sigma Bending

Shear Stress


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point C stress Analysis: d2

Sigma Bending

Shear Stress


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Material Selection

The material selection process is reduce

and analysis is reduced to steel

materials. This due the reliability and

value of this well known and very oftenused material. Ceramics, polymers,

composites and other metals where

unconsidered because the superiority of

steel alloys, the availability and value in

the industry


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Material Selection

Three specific Steel alloy are considered :

: Low carbon steel use in many application

because ins malleable, ductile and cheap, but it cannot be heat

treated.

: Medium carbon have a good balance

between yield strength and ductility.

: High carbon steel have a high hardness and

yield point but it have a low ductility.


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Material Selection

Property High Carbon Steel 1055 Low carbon Steel 1010 Medium Carbon Steel 1045

Elastic modulus (Gpa) 190 190 190

Poison Ratio 0.3 0.3 0.3

Yiel Strenght (Mpa) 560 305 505

Elongation to fracture 10% 20% 12%

Hardness @ T=25 197 105 170

Properties of the considered materials


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Diameter Calculation

Using the MSS theory:

Using the DET theory:


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Diameter calculations

Point C :


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Diameter calculations

Point B :

Value found by Iteration In Excel


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Stress Concentration


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Diameter - Stress

Concentration


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Slope and deflection

Slope in Plane XZ

Deflection Plane XZ


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Slope and deflection

Slope in Plane YZ

Deflection Plane YZ


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Questions ?


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Resources

MD Solids 3.5 software. www.mdsolids.com

http://www.efunda.com/materials/alloys/carbon_steels/list_ca

rbon.cfm?m=ais&Page_Title=AISI%2010xx&ID_Low=AISI_1

0

http://www.efunda.com/materials/alloys/alloy_home/steels.cf

m

http://www.metalsupplies.com/mild-steel-rounds.html
http://www.efunda.com/materials/alloys/carbon_steels/list_carbon.cfm?m=ais&Page_Title=AISI%2010xx&ID_Low=AISI_10http://www.efunda.com/materials/alloys/carbon_steels/list_carbon.cfm?m=ais&Page_Title=AISI%2010xx&ID_Low=AISI_10http://www.efunda.com/materials/alloys/carbon_steels/list_carbon.cfm?m=ais&Page_Title=AISI%2010xx&ID_Low=AISI_10http://www.efunda.com/materials/alloys/alloy_home/steels.cfmhttp://www.efunda.com/materials/alloys/alloy_home/steels.cfmhttp://www.efunda.com/materials/alloys/alloy_home/steels.cfmhttp://www.efunda.com/materials/alloys/alloy_home/steels.cfmhttp://www.efunda.com/materials/alloys/alloy_home/steels.cfmhttp://www.efunda.com/materials/alloys/carbon_steels/list_carbon.cfm?m=ais&Page_Title=AISI%2010xx&ID_Low=AISI_10http://www.efunda.com/materials/alloys/carbon_steels/list_carbon.cfm?m=ais&Page_Title=AISI%2010xx&ID_Low=AISI_10http://www.efunda.com/materials/alloys/carbon_steels/list_carbon.cfm?m=ais&Page_Title=AISI%2010xx&ID_Low=AISI_10http://www.efunda.com/materials/alloys/carbon_steels/list_carbon.cfm?m=ais&Page_Title=AISI%2010xx&ID_Low=AISI_10http://www.efunda.com/materials/alloys/carbon_steels/list_carbon.cfm?m=ais&Page_Title=AISI%2010xx&ID_Low=AISI_10

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