Correlation of Charpy impact between welded and unwelded material

Tajudin, Muhammad Hafizin Arif (2022) Correlation of Charpy impact between welded and unwelded material. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

This thesis investigates the effects of different parameters which is type of materials and material thickness on the results of energy absorption and impact strain signal behaviours due to Charpy impact test. Findings from Charpy impact test was used to investigate the correlation of absorb energy between welded and unwelded (based) material. This thesis also analyze the the study of impact signal between the welded and unwelded material. Hence, covers the study of material thickness effect on energy absorbtion. Mild steel is the common type of steel that used in automotive industry because of its material characteristics and lowcost manufacturing production. Due to its massive usage in the automobile parts, this steel must be design in variety ways to meet both crash safety and performance needs. Recently, the number of accident on highway has been increased due to loss of structure integrity to withstand high impact load. On collision, one of the concertrates matter is the joint of automobile parts especially body chasis which joint together by the welding process. This give an idea on how weld zone has effect the base material after the application of welding process and what is the effect of impact energy on weld zone compared to the base material. To better understand about this phenomenon, this study has to be done between two types of specimens which is welded material and unwelded material. These specimens must be test with the Charpy impact test, also known as the Charpy V-notch test to measure the amount of energy absorbed by the specimen during fracture. By the additional application of strain gauge, we can correlate the energy absorbed with strain energy by installing strain gauge to striker hammer that connected to data acquisition system (SOMAT eDAQ). Through the test we can also visualize the difference of impact signal between the welded and the unwelded material. Besides that, mechanical testing of tensile test with the same material is carried out to obtain the material behavior and to identify the material properties for additional and supporting data purpose.

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