# Mec211

Good Essays
2107 Words
Grammar
Plagiarism
Writing
Score
Mec211
Chapter 1
General concepts of stress and strain

• The end of the chapter, the students should be able to:
– Find internal forces of a body
– Calculate the average normal stress and average shear stress of a body subject to axial forces and shear forces respectively
– Calculate the normal strain from a body`s deformation
– Understand and be able to apply the relationship between stress and strain.
– Locate and identify material characteristics associated with a tensile test stress-strain diagram
– Solve the problems of modulus of elasticity, modulus of rigidity and poisson`s ratio
– Calculate a factor of safety, axial strain and lateral strain

7/7/2014

1

Chapter 1
General concepts of stress and strain
1.0 Introduction
• Strength of materials is a branch of applied mechanics that deals with the behavior of solid bodies subjected to various types of loading. Other names for this field of study are mechanics of materials, mechanics of solids and mechanics of deformable bodies.
• The main objective of the study of mechanics of materials is to provide the future engineer with the means of analyzing and designing various machines and load bearing structures
• Both the analysis and design of a given structure involve the determination of stresses and deformations.
1.1 Normal stress and strain
• Axial load/force is an external load/force directed along the axis (centroid axis) of the member, resulting in either tension or compression in the prismatic bar (straight member with constant cross section)

7/7/2014

2

Chapter 1
General concepts of stress and strain
X Y

P

P

P
X

Y
Axial force

a) Tension force

Axis

b) Compression force

• Internal force can be seen from the cutting plane x-x and y-y as below.
• Internal forces are the forces which hold together the particles forming the rigid body
– R – resultant internal force
– Rn – component force (perpendicular to plane y-y)
– Rt – component force (tangent to plane y-y)

7/7/2014

3

Chapter 1
General concepts of

## You May Also Find These Documents Helpful

• Powerful Essays

iBISC403 Genetics and Evolutionary Biology Exam 2, March 22, 2012 Instructions: 1. Grid in your name on the answer sheet. 2. DO NOT grid in your student number, the course number or section. 3. Print your last name at the top of this cover page and short answer pages. 4. At the end of the exam, turn in your exam and your answer sheet together. All multiple choice questions are of equal value and together are worth 80% of the exam. The three short answer questions are each of indicated value and worth 20% of the exam.…

• 2334 Words
• 10 Pages
Powerful Essays
• Satisfactory Essays

2. In Exercise 2, what was the difference between the Student## account you use to log on at the beginning of the lab and the domain Administrator account that enabled you to successfully create a new subdomain?…

• 1327 Words
• 4 Pages
Satisfactory Essays
• Powerful Essays

Being that cross shears are equal, and area A’ being finite, the shear stress can be calculated with equation 3.…

• 2079 Words
• 9 Pages
Powerful Essays
• Satisfactory Essays

4. The transfer of tissue or an organ between two people who are not related is called?…

• 428 Words
• 3 Pages
Satisfactory Essays
• Good Essays

All principal local authorities (i.e. metropolitan districts, shire counties, shire districts, shire unitaries), these agencies are responsible for funding and how money is spent within their area of care.…

• 1266 Words
• 6 Pages
Good Essays
• Satisfactory Essays

to make as many decisions about their care as possible and to support the individuals to do as…

• 692 Words
• 2 Pages
Satisfactory Essays
• Satisfactory Essays

1. Label each structure as belonging to the (a) central nervous system or (b) peripheral nervous system…

• 388 Words
• 2 Pages
Satisfactory Essays
• Powerful Essays

2. Which of the following events would cause a rightward shift in the market-supply curve for large automobiles?…

• 1925 Words
• 8 Pages
Powerful Essays
• Satisfactory Essays

What are the methods of inquiry and how are they used by an investigator. The methods of inquiry are who, what, where, when, why and how. An investigator will need to use these effectively to do his or her job to its fullest. Everyone uses these on an ever day basis, when you see something you naturally want to know the rest of these things. As an investigator getting this information through crime scene investigation or outside of the scene investigation, for example finding peoples names at local pawnshops can help the investigator find the suspect if they sold stolen product.…

• 329 Words
• 2 Pages
Satisfactory Essays
• Satisfactory Essays

## Mgt311

• 3831 Words
• 16 Pages

Faculty and students/learners will be held responsible for understanding and adhering to all policies contained within the following two documents:…

• 3831 Words
• 16 Pages
Satisfactory Essays
• Good Essays

There are a number of conditions that can have an impact on the correct movement and positioning of people.…

• 548 Words
• 3 Pages
Good Essays
• Better Essays

1.1 Identify the different reasons people communicate/ 1.2 Explain how communication affects relationships in the work setting…

• 2165 Words
• 9 Pages
Better Essays
• Satisfactory Essays

1.1 To express needs and feelings to others. You may share your ideas, feelings, experiences and information. You build relationships and maintain relationships through good communication. Ask questions and give encouragement.…

• 537 Words
• 3 Pages
Satisfactory Essays
• Good Essays

1 To better meet needs of individuals with dementia, caregivers should focus on receiving and interpreting verbal and nonverbal messages conveyed by the afflicted individuals.…

• 500 Words
• 2 Pages
Good Essays
• Satisfactory Essays

Every individual has the right to communication as the Human Rights Act (1998) lists the freedom of expression as well as other rights relating to communication. As a support worker I have a moral obligation as well as adhering to the standards, codes of practice, guidelines, morals and law that govern my practice to ensure that communication needs are met.…

• 289 Words
• 2 Pages
Satisfactory Essays