Helpdesk: WhatsApp: 0736552548 Email: info@kenyaplex.com

Properties of Engineering Materials Notes

Institution: College

Course: Certificate/Diploma in Mechanical Engineering

Content Category: Class Notes

Posted By: 6611588

Document Type: PDF

Number of Pages: 21

Price: KES 100

Views: 576 Downloads: 2

Summary

DOWNLOAD Properties of Engineering Materials Notes
Definition of terms
1. Ferrous metals : are those metals which have the iron as their main constituent
e.g.
• pig iron
• alloy steel
• cast iron irons,
• carbon steels,
• alloy steels,
• stainless steels,
• tool and die steels
2. Non-ferrous metals : are those metals which have a metal other than iron as main constituent
e.g.
• aluminium
• copper
• zinc
• brass
• bronze
3. Alloy : are metallic substances composed of two or more elements as either a compound or a solution
e.g.
• bronze
• brass
4. Plastic: are synthetic organic materials, which can be moulded into desired shape when subjected to heat and pressure.
Eg
• pvc (polyvinyl chloride)
• rubber
• synthetic materials
Materials are classified into four main groups, these being determined by their internal structure and consequentials properties
The four main groups are;
1. Metals
2. polymers
3. composites
4. semiconductors
I. METALS
Engineering metals are generally alloys, these being formed by mixing two or more elements for example
a) Mild steel is an alloy of iron and carbon
b) Stainless steel is an alloy of iron chromium, carbon , manganese
The reason for addition is o improve their properties
? Carbon improves the strength of iron
? Chromium in stainless steel improves corrosion resistance
Properties of metals
? High electrical conductivity
? High thermal conductivity
? High relatively stiffness
? High strength
? Can be ductile and thus permit products to bre bend into shape
Classification of metals
a) Ferrous metals i.e iron based alloys
b) Non ferrous alloys i.e not iron alloys e.g aluminium and copper based alloys
II. POLYMERS
These are based on long chain molecules, generally with carbon back bones
Polymers have low electrical conductivity and low low thermal conductivity hence their use for electrical and thermal insulation
When compared with metals have lower densities, expand more when there is change in temperature, generally more corrosion resistant,a low stiffness,stretch more and are not as hard When load they tend to creep I.e the extension gradually changes with time
Polymers include the familiar plastic and rubber materials. Many of them are organic compounds that are chemically based on carbon, hydrogen, and other nonmetallic elements Some of the common and familiar polymers are polyethylene (PE), nylon,poly(vinyl chloride) (PVC),polycarbonate (PC), polystyrene (PS), and silicone rubber.
These materials typically have low densities , whereas their mechanical characteristics are generally dissimilar to the metallic and ceramic materials—they are not as stiff nor as strong as these other material types.
However, on the basis of their low densities,many times their stiffnesses and strengths on a per mass basis are comparable to the metals and ceramics.
In addition, many of the polymers are extremely ductile and pliable (i.e., plastic), which means they are easily formed into complex shapes. In general, they are relatively inert chemically and unreactive in a large number of environments.
One major drawback to the polymers is their tendency to soften and/or decompose at modest temperatures, which, in some instances, limits their use.
Furthermore, they have low electrical conductivities and are nonmagnetic. Fiberglass is sometimes also termed a “glass fiber-reinforced polymer” composite, abbreviated “GFRP.” Many of these are organic substances and derivatives of carbon and hydrogen. Polymers include the familiar plastic and rubber materials.
Usually polymers are classified into three categories: thermoplastic polymers, thermosetting polymers and elastomers, better called as rubbers.
Polymers have very large molecular structures. Most plastic polymers are light in weight and are soft in comparison to metals.
Polymer materials have typically low densities and may be extremely flexible and widely used as insulators, both thermal and electrical.
Typical examples of polymers are polyesters, phenolics, polyethylene, nylon and rubber.
The overriding consideration of the selection of a given polymer is whether or not the material can be processed into the required article easily and economically.
1. Crude oil supplies the majority of the raw material for the production of polymers, also called plastics
2. Polymers can be divided into 3 categories:

Below is the document preview. Purchase to access the complete document.

........

This is the end of this document preview. Buy to download the complete document.

More Resources

Grade 4 French Assessment Test Term 1 2021
Grade 4 French question paper term 1. It assesses the content covered in class in term 1.

Price: KES : 100
Grade 5 French Assessment Test Term 1 2021
Grade 5 French question paper term 1. It assesses the content covered in Grade 4 and Grade 5 in term 1.

Price: KES : 100
Grade 4 French Assessment Test Term 1 2022
Grade 4 French Assessment Test Term 1 2022

Price: KES : 100
2024 Grade 7 CRE Lesson Notes Term 1
Download CRE grade 7 cbc lesson notes. the notes are proffesionally prepared for teachers and students. Note: 1. teachers Should thoroughly exhaust relevant areas in substrands for student to...

Price: KES : 90
Grade 3 Rationalized Creative Arts Notes Term 1
Grade 3 Rationalized Creative Arts Notes for term 1

Price: KES : 100
Critically expose Jonathan Swift’s ‘Gulliver’s Travels’ to Post modernism study: LIT 410
Critically expose Jonathan Swift;s "Gullivers Travels" to a post modernism approach. - The paper gives an insight to how you can evaluate the above mentioned text using a post modernism approach. -...

Price: KES : 100
Business Studies: Forms of Business Units Notes
Short notes on Business Studies: Forms of Business Units ............

Price: KES : 47
Physics Notes on Heat Energy
A clear summary of heat energy topic taught in high school. Heat Energy Notes.

Price: KES : 29
AEC 418 Project Appraisal and Evaluation - Project Appraisal Case Studies
This is a well highlighted and well explained topic about project appraisal case studies. It has the following sub topics: (i) Transport networks (ii) Project identification (iii) Feasibility and...

Price: KES : 100
Second Year Human Resource Management Notes
These notes help build adequate understanding concerning the human resource management in an organization including its environment, both micro and macro explained in detail.

Price: KES : 300
Management Information System Notes for 2nd Year
I have prepared my notes after research and i think they have the content needed in this unit.They are 15 pages in number and they cover the major parts of the unit.The best way to proof them is by...

Price: KES : 350
Computer Studies Notes
Introduction to computer studies notes. Brief Overview: Definition of a Computer: - A Computer is an electronic device that operates (works) under the control of programs stored in its own...

Price: KES : 200
CCP 4I6: Security Design and Formulation Notes
CCP 4I6: Security Design and Formulation Notes Brief Overview: 2 Introduction Physical security is defined as: Physical measurers, policies, and procedures to protect an organizations systems,...

Price: KES : 300
UCU 104: Introduction to Entrepreneurship Notes
This is a summarized class notes document for the entire unit. The notes include some practice exercises that can speculate how the continuous assessment and final exams look like. Brief...

Price: KES : 1200
Medical Physiology Notes
These notes include the definition of protozoa, the relationships between the protozoa and the host, the reproduction of protozoa and taxonomy of protozoa.

Price: KES : 300
AAS 3316 Animal Health Management
These notes contain detailed information on livestock metabolic diseases,their clinical signs, the animals they affect,control measures as well as the treatment to be administered.

Price: KES : 100
AAE 3412: Principles of Agricultural Marketing Notes
The notes contain key principles and information on agricultural marketing. Brief Overview: 1.1 Purpose of the Course This course aims at introducing students to how the market works and how...

Price: KES : 250
Kenya Methodist University Diploma in Pharmaceutical Technology Pharmacology Notes
The notes define various terms used in Pharmacology and various modes of administration of drugs. They also state the various forms of drugs, definition of bioavailability of drugs and the factors...

Price: KES : 250
KCSE 2016 Agriculture Paper 1 Questions and Answers
Agriculture Kcse 2016 Paper 1 questions and answer. This is good revision material for the candidates. Brief Overview: No.1.List four factors that would determine the stage at which a crop is...

Price: KES : 30
Form 3 Biology Sample Questions and Answers
This document contains comprehensive notes for form 3. They are very beneficial to students and teachers. Brief Overview: 1. a) i) What is meant by the term binomial nomenclature? - scientific...

Price: KES : 290
Geography Form 2 article on Batholiths
This is an easy to read article on Batholiths that is comprehensive but enjoyable. It simplifies the description of batholiths. The objective is to make the topic less abstract.

Price: KES : 50
Evidence Law Notes CLS 202
The notes are structured in a systematic way according to the council of legal education requirement for the core law subject Evidence law. Case laws, statutes and the constitution are provided in...

Price: KES : 950
Physical education notes for PTE 1st years and 2nd years
Looking for Primary Teacher Education (PTE) notes for physical education 1st year and 2nd year? You can find them here. These notes helps the tutor in lecturing and the student teacher in revisions...

Price: KES : 200
Solved Questions for Macroeconomics
Solved questions and answers for macroenomics. High quality questions with answers. Brief Overview: Chapter 3, Question 1 (Evolution of the household) Determine whether each of the following...

Price: KES : 259
Education Notes for Primary Teacher Education (PTE)
These notes may be used by tutors in lecturing and student teacher in revision. This document summaries the main content of the new syllabus for teachers’ colleges. Besides samples examination...

Price: KES : 200
English Methodology Notes for Primary Teacher Education (PTE)
English Methodology Notes for Primary Teacher Education (PTE). These notes may be used by student teacher in revision.. Brief Overview: Definition of Language Language as a word is based on the...

Price: KES : 200
Kiswahili Ushairi Notes
Best Ushairi Kiswahili notes. It is in point form to help both the teacher and the student in Ushairi. Brief Overview: Kitengo Ushairi Mashairi yanaweza kugawanywa katika aina mbalimbali...

Price: KES : 100
Kiswahili Notes for Teachers and Students
This document contains Kiswahili notes which may be used by the teacher in teaching and the student in revision. Brief Overview: STADI ZA LUGHA Katika Kiswahili kuna sauti mbili ambazo...

Price: KES : 200
Detailed Oral literature Notes and Model Questions
Oral literature is one of the are as tested in Literature in English of the Kenya Certificate of Secondary Education Examinations. The other are as in this paper include The Novel, Drama, Poetry and...

Price: KES : 100
Biology Form Four Notes on Evolution
FORM FOUR BIOLOGY CLASS NOTES TOPIC: EVOLUTION Topic objectives At the end of this topic, the learner should be able to: I)Define the term Evolution II) Describe the origin of life III) Describe...

Price: KES : 50

Properties of Engineering Materials Notes

Summary

More Resources

More Content By 6611588