P1 Unit 4 Essay

Assignment front sheet

Learner name Assessor name
Gregory Emerson MR P. REEVES
Date issued Completion date Submitted on
5/1/2015 30/1/2015 23/1/2015
Qualification Unit number and title
BTEC EXTENDED DIPLOMA IN ENGINEERING UNIT 10: PROPERTIES & APPLICATIONS OF ENGINEERING MATERIALS Assignment title ASSIGNMENT 3:
In this assessment you will have opportunities to provide evidence against the following criteria.
Indicate the page numbers where the evidence can be found.
Criteria reference To achieve the criteria the evidence must show that the student is able to: Task no. Page numbers
P6 Describe the principles of the modes of failure known as ductile/brittle fracture, fatigue and creep
P7 Perform and record the results of one destructive …show more content…
They can be defined by the different characteristics they have when they break. Brittle objects will break easily when subject too little force. A brittle material has a very small plastic deformation point meaning that it breaks easily. A ductile material has a higher plastic deformation point meaning that it is more malleable. As you can see from this graph a brittle material breaks easily when subject to little amount of stress. On the other hand a ductile material has a higher plastic deformation point meaning that it is more malleable. The two little diagrams at the bottom of the graph show the difference in how they break. The bigger the grain size of the material the more ductile a material is. The smaller the grain size the more brittle and hard it is. http://upload.wikimedia.org/wikipedia/commons/0/00/Brittle_v_ductile_stress-strain_behaviour.png Task 2
There are a few differences between high cycle and low cycle fatigue. High cycle fatigue means that something would be under low strain. For example if a car has camber then this will be low cycle, this is because the wheel would have to be changed more often because the wheel would wear more unevenly because it is under more strain. On the other hand if a car did not have any camber and was sitting like a normal wheel then this would be high cycle. The reason for it being high cycle is because it is under low strain. This means that the …show more content…
You can test materials characteristics by tensile testing. This type of testing is good as you could find out ultimate tensile strengths which means you can find out things such as integrity and safety of materials. The things you can find out from tensile testing are things such as elastic limit which is the maximum point it can be stretched and it goes back to its original shape also called Young’s Modulus. You can also find out ultimate tensile strength. The ultimate tensile strength is the maximum that a material can be stretched until it snaps. Tensile testing has many applications, for example it is used in packaging industry. They test the tensile strength of packaging when fused together with an adhesive. They will test how strong the adhesive is and if the adhesive is up to the standard that is

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