Answered: Given your understanding of what…

Given your understanding of what initiates and controls failure in materials, which of the following will increase the failure strength or lifetime of a test piece or component and why? a.

Welding: Principles and Applications (MindTap Course List)

8th Edition

ISBN:9781305494695

Author:Larry Jeffus

Publisher:Larry Jeffus

Chapter25: Testing And Inspection

Section: Chapter Questions

Problem 39R: What information does a hardness test reveal?

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Concept explainers

Thermal Properties of Materials

In mechanical engineering, the thermal property is represented as the physical quantity that is relevant to the application of heat. The thermal properties are evaluated by variations in any specific material due to low heat or high heat. The quantities that influence the thermal property of the materials are mass, density, temperature, and many others.

Question

Given your understanding of what initiates and controls failure in materials, which of the following will increase the failure strength or lifetime of a test piece or component and why?

Increasing the grain size so there are less grain boundaries to initiate failure

Decreasing the temperature below the brittle-ductile transition temperature, to make it harder

Decreasing the difference between the maximum and minimum stress values, as this effects the stress concentration factor

Polishing to reduce surface defects

Increasing its volume, to give a larger cross sectional area

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What information does a hardness test reveal?
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