Term
The stress at which plastic deformation begins is called the |
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Definition
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| The stress at which the maximum force that can be withstood by either a ductile or a brittle material is called the |
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| The slope of the stress-strain curve, which is determined primarily by the strength of the atomic bonds within the material, is called the |
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| When you design a part or select a material for a given application, you almost always want to be sure that the stress acting on the material during its service |
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Definition
| is below the yield strength |
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Term
| Necking of a ductile material occurs when the applied stress |
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Definition
| reaches the tensile strength |
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Term
| The stiffness of a material is most closely related to |
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Definition
| the modulus of elasticity |
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Term
| For a given applied force, we expect that the true stress acting on a material will be |
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Definition
| higher than the engineering stress |
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| almost always, as the temperature increases, |
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Definition
| the elastic portion of a stress-strain curve |
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| We would expect that the percent reduction in area will be larger for a material that |
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Definition
| breaks after a large amount of necking has occured |
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Term
| If we want to shape a metal into a complex part by bending, forging, or some other metal-working process, we must |
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Definition
| always be sure that the stress applied during the metal working process is above the yield strength |
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Term
| Which hardness test measures the depth of penetration to determine the hardness of a material? |
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Definition
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Term
| The tensile strength of a steel specimen with a measured hardness of 240 BHN is approximately |
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| When a component possesses a flat fracture with little or no plastic deformation, it is said to have fractured by which of the following |
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Term
An irregular, granular appearance on a fracture surface is normally indicative of
which type of fracture? |
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Definition
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Term
Chevron markings and radial lines typically occur with which of the following types of
fracture? |
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Definition
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Term
| Chevron markings on a component point back to |
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Definition
| The point of initiation of the crack |
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| Beach marks are commonly seen on which type of fracture surface? |
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Definition
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| Each striation on a fracture surface corresponds with one loading cycle. |
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Definition
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| Striations are visible with the naked eye. |
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Definition
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| Particularly in brittle fracture, the crack propagates in a direction |
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Definition
| perpendicular to the applied tensile stress |
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Term
| A ductile cup-and-cone fracture is typically produced |
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Definition
| through microvoid coalescence |
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Term
| The plane strain fracture toughness K1c is |
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Definition
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Term
| Which of the following is not a factor that affects whether or not a material will fracture in a ductile or brittle manner? |
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Definition
| all of these affect the mode of fracture |
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Term
| Because of the nature of impact testing |
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Definition
| the data should only be used qualitatively in design |
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Term
| One of the most important properties obtained through impact testing is |
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Definition
| the ductle-brittle transition temperature |
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Term
In which of the following metals would we not expect to see a ductile-brittle
transition? |
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Definition
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Term
| One method to improve the fatigue life of a component is to |
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Definition
| Impart residual compressive stresses at the surface of the part. |
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