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STRENGTH OF M ATERIALS ABORAT ORY COMPRESSION TEST

STRENGTH OF M ATERIALS ABORAT ORY COMPRESSION TEST

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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Name of a report STRENGTH OF MATERIALS Hello sir, I have a report, please, the solution is text keyboard, it will be a solution for one or two pages. It doesn't matter.
1. Introduction A compression test is conducted in a manner similar to tensile test, except that the force is compressive and the specimen contracts along the direction of stress. By convention, a compressive force is taken to be negative, which yields a negative stress, compressive strains are also negative. Tensile tests are more common because they are easier to perform; also, for most materials used in structures application, very little additional information is obtained from compressive test. STRENGTH OF M ATERIALS ABORAT ORY COMPRESSION TEST 2. Theory When a material is subjected to compressive loading, the relationship between stress and strain is similar to that obtained for a tensile loading. Up to a certain value of stress, the material behaves elastically, i.e. stress is in proportion to strain. Beyond this value, plastic flow starts, i.e. more strain starts than happening in elastic limit for any increment value of loading. It is seen that a compression test is more difficult to be conducted than standard tensile test due to (i) specimen must have larger cross-sectional area to resist any buckling due to bending, (ii) the specimen undergoing strain hardening as deformation proceeds, and (iii) cross- section of the specimen increases with deformation, thereby requiring substantial increase in the required load. The lateral instability due to buckling action can be avoided by keeping the ratio of height (h) to diameter (d) of the specimen less than 2. The compressive strength essentially depends open h' to d' ratio. Hence, higher is 'h' to 'd' ratio, lower is the compressive strength. (-) strain (*) strain - The compressive test is the opposite of the tensile test, as follows: 1- The area under pressure is square, rectangular or eircular. 2- In this test, we calculate a percentage of swelling and a percentage of contraction. 3- This experiment is conducted on brittle materials. 4- In this experiment there are no yield points. 3. Objective of the Experiment Observe the stress strain behavior of the metals under compression load. Determine the strength and other properties of various materials. Studying the relationship between force (p) and contraction. Proving and studying the relationship between strain (E) and stress (6). Studying the concept of mechanical properties of solid materials. 4. Difference Between Tensile and Compression Test Tension test is normally conducted to obtain the mechanical properties of Metals. It is the primary test used for quality control and the basis for acceptance and refusal of metallie products used in construction and other uses. Compression test is used to obtain the mechanical properties and is the basis acceptance and refusal of brittle nonmetallic and other materials that have very low strength in tension like concrete, wood, masonry, etc.
Transcribed Image Text:1. Introduction A compression test is conducted in a manner similar to tensile test, except that the force is compressive and the specimen contracts along the direction of stress. By convention, a compressive force is taken to be negative, which yields a negative stress, compressive strains are also negative. Tensile tests are more common because they are easier to perform; also, for most materials used in structures application, very little additional information is obtained from compressive test. STRENGTH OF M ATERIALS ABORAT ORY COMPRESSION TEST 2. Theory When a material is subjected to compressive loading, the relationship between stress and strain is similar to that obtained for a tensile loading. Up to a certain value of stress, the material behaves elastically, i.e. stress is in proportion to strain. Beyond this value, plastic flow starts, i.e. more strain starts than happening in elastic limit for any increment value of loading. It is seen that a compression test is more difficult to be conducted than standard tensile test due to (i) specimen must have larger cross-sectional area to resist any buckling due to bending, (ii) the specimen undergoing strain hardening as deformation proceeds, and (iii) cross- section of the specimen increases with deformation, thereby requiring substantial increase in the required load. The lateral instability due to buckling action can be avoided by keeping the ratio of height (h) to diameter (d) of the specimen less than 2. The compressive strength essentially depends open h' to d' ratio. Hence, higher is 'h' to 'd' ratio, lower is the compressive strength. (-) strain (*) strain - The compressive test is the opposite of the tensile test, as follows: 1- The area under pressure is square, rectangular or eircular. 2- In this test, we calculate a percentage of swelling and a percentage of contraction. 3- This experiment is conducted on brittle materials. 4- In this experiment there are no yield points. 3. Objective of the Experiment Observe the stress strain behavior of the metals under compression load. Determine the strength and other properties of various materials. Studying the relationship between force (p) and contraction. Proving and studying the relationship between strain (E) and stress (6). Studying the concept of mechanical properties of solid materials. 4. Difference Between Tensile and Compression Test Tension test is normally conducted to obtain the mechanical properties of Metals. It is the primary test used for quality control and the basis for acceptance and refusal of metallie products used in construction and other uses. Compression test is used to obtain the mechanical properties and is the basis acceptance and refusal of brittle nonmetallic and other materials that have very low strength in tension like concrete, wood, masonry, etc.
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