In what class of material is stress whitening often seen, and what is the physical origin of the phenomenon?

Q: What are the factors that affect the ultimate choice of the material?

A: There are two important principles that should apply to materials for their ultimate choice:…

Q: What are intergranular fracture and transgranular fracture? When do they usually happen?

A: Intergranular fracture and transgranular fracture are types of fracture generally occurs in micro…

Q: Describe the test methods that can be used to reflect the fatigue and creep resistance of materials…

A: Fatigue and creep are two important material properties that determine the longevity and reliability…

Q: What is the stress-strain curves of materials?

A: The stress-strain curves shows the behaviour of material specimen when subjected to tension or…

Q: What is the role of dislocations in plastic deformation

A: Plastic deformation:  It is the permanent distortion which occurs in a material when a tensile,…

Q: Components that suffered fatigue failure during operation can be identified byseveral characteristic…

A: Some characteristic features of fatigue failure in components include:Explanation:Crack Initiation:…

Q: Describe the general trends that connect stress level and temperature with steady-state creep rate…

A: Creep is a kind of deformation seen in the material subjected to cyclic loading. The gradual slow…

Q: What are the distinguishing differences between elasticity, plasticity, and fracture?

A: There are the following differences between elasticity, plasticity and fracture. Elasticity:- It is…

Q: What is thermal stress?

A: Thermal stress: When the temperature of the material is altered, the material tries to change its…

Q: What is the Distortion energy failure theory? Under what loading types and materials would you use…

A: The Distortion energy failure theory states that a material yields or fails when the total…

Q: What are the units and equations for shear stress and shear strain

A: Stress: The ratio of the internal resistive shear force to the cross-sectional area of the object is…

Q: Are fatigue striations always visible on a fatigue fracture surface? If not, under what conditions…

A: Answer Fatigue Striation : these are the marks induced on the surface of fracture and goes on…

Q: Why do most materials exhibit fracture strengths much lower than their theoretical capacities to…

A: In theory, the calculations are done by assuming that the material is ideal i.e there is no defect…

Q: Is the presence of microvoid coalescence on a metal fracture surface inconsistent with macroscopic…

A: Microvoid Coalescence: It is a mechanism to show the failure method of a ductile material.

Q: Draw a stress vs strain rate curve for a shear thinning material. How does the viscosity of such a…

A: Shear thinning is a phenomenon characteristic of some non-Newtonian fluids in which the fluid…

Q: Which properties are affected by plastically deforming a metal specimen near room temperature? Do…

A: Concept: Plastic Deformation: 1) It is the process of deforming the material by application of…

Q: Explain and discuss briefly: (1) Whether a larger fracture toughness is associated with an…

A: 1) In general, a larger fracture toughness is associated with a slowly cooled Fe-0.6wt%C product…

Q: Define the strain (or elastic) energy release rate first in words, then as an energy-based equation.

A: To define the strain (or elastic) energy release rate first in words, then as an energy based…

Q: What are the basic differences between linear elastic, plastic and anelastic deformation behavior of…

A: Elastic deformation behavior When an external load is applied to the material, the material will…

Q: Do the irregularities vary from specimen to specimen in tensile fracture?

A: The tensile strength of the same specimens can be identical, but the surface irregularities are not…

Q: 2a: How a material can be mechanically strengthened by designing the grain size after…

A: Hello. Since your question has multiple sub-parts, we will solve the first three sub-parts for you.…

Q: If the material is ductile and subjected to a static load , is it not necessary to use stress…

A: It is not necessary to use stress concentration factors for ductile material under static loading…

Q: Analyse effects of cold work and Annealing in term of change in microstructure and mechanical…

A: Cold Working:-  Cold working is a metal working process which can be done at below its…

Q: What happens or characteristics you observed when you change the copper wire material to aluminum…

A:

Q: Discussion of the concept of metal springs referring to the factors considered in the design of…

A: Concept of metal springs, referring to the factors considered in the design of metal springs.

Q: What two general competing processes control the creep rate of a metal? What is the relative…

A: The two general competing processes that control the creep rate are strain hardening and strain…

Q: What are the units and equations for determining yield strength?

A: The yield strength of a material can be determine using a tensile test. The final results of the…

Q: What are the major material groups?

A: There are usually four category or group of materials namely: Metals, Polymers, Ceramics, Composites…

Q: Why is it not necessary to use stress concentration factors if the material is ductile?

A: Stress concentration is a location in a member under load where the magnitude of stress is…

Q: In a typical engineering stress-strain diagram, stress keeps on increasing after yield point due to…

A: Stress Strain Curve is a graphical representation of the behaviour of a material when a load or…

Q: What cross-sectional property is influenced by the size effect factor between the depth and width of…

A: The properties that get affected by the depth and the width of the member are given below: (A) The…

Q: Define the term Stiffness? of materials?

A: Stiffness: Stiffness is a property of material due to which an object resists deformation when an…

Q: Why is fatigue generally less of a problem with ceramics and glasses than with metals and polymers?

A: Fatigue is defined as a mechanical failure in which material is failed under its yielding strength.…

Q: How can the fatigue be prevented?

A: Fatigue: Fatigue is the deformation material due to cyclic loads applied to it. This results in the…

Q: Why inclusion can decrease fatigue strength?

A: Fatigue strength is the measure of maximum stress for a material which can sustain without failure…

Q: When does the Fatigue occur in the material?

A: When a material is subjected to repeated or cyclic loading then the failure in the material is…

Q: Distinguish between the Brittle material and the Ductile material?

A: Brittle Materials: These materials elongate on the application of load to the materials. They can…

Q: What is a fatigue limit, and what relevance does it have for lifetimes in the gigacycle (109)…

A: Fatigue is a kind of failure that occurs in a material when they are constrained to repeated…

Q: Since Creep is the time dependant deformation of a material, does temperature or stress play an…

A: Although creep is a time dependent phenomenon, temperature and stress causes the creep to…

Q: B/ what are the mechanisms for creep?

A: Solution:

Q: Summarize the differences between intrinsic toughening processes and extrinsic toughening processes…

A:

Q: As a fatigue crack grows from its initial length to its final length, does it spend most of its life…

A: Fatigue failure: Fatigue failure is defined as the formation and the propagation of the crack in a…

Q: What would happen to the wire if it were stretched beyond its elastic limit? What would happen to…

A: Consider the diagram of stress vs strain for tension test for a typical tensile metal as shown…

Q: Why is heat treatment typically an integral part of the process flow for bulk deformation of metal?.

A:

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.