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MECHANICAL PROPERTIES OF AB MATERIALS

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FINAL EXAMINATION 3984972290

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MECHANICAL PROPERTIES OF AB MATERIALS
 

MECHANICAL PROPERTIES OF AB MATERIALSVersión en línea

FINAL EXAMINATION 3984972290

por Grace Balahay
1

are those characteristics having to do with the change in shape and size of a material when forces are applied

2

is the applied force per unit area and may be expressed as Newtons per square meter (Pascals), pounds force per square inch, kilograms force per square meter, etc. The force may produce tension, shear, or compression within the sample.

3

involves both tension and compression.

4

involves only shear forces.

5

is a stress resulting from forces directed away from the sample. Stretching a rubber band produces tensile stress in the band.

6

is a stress resulting from forces directed at the sample and acting to push on, or compress, it.

7

is the stress that is tangential to the plane on which the forces act tending to change the sample's shape. It is produced like a tensile (or compressive) but the two pulling (or pushing) forces are offset from each other.

8

is that shear stress exerted on the sample resulting from a twisting

9

is the change, due to the applied force, in the size or shape of a body referred to its original size or shape. Is a dimensionless quantity, but it is frequently expressed in meters per meter, inches per inch, or percent.

10

refers to the ability of the material to withstand localized permanent deformation achieved typically from indention. It may also be used to describe deformation due to other actions such as cutting, abrasion, penetration, and scratching.

11

The type of deformation under consideration when measuring hardness is __________ in which the material will not return anymore to its original shape after being deformed.

12

is the capacity of a material to withstand loads tending to reduce size or being pushed together. Some materials fracture at their compressive strength limit; others deform irreversibly, so a given amount of deformation may be considered as the limit for compressive load. is a key value for design of structures.

13

is the maximum stress a material is capable of sustaining without failure.

14

is calculated utilizing the maximum load during a tension test and is based on the sample's original cross-sectional area

15

is a measure of the ability of a material to withstand a sudden load without failure.

16

is often erroneously referred to as impact strength, when in fact it is not about strength at all.

17

is sensitive to any particles, voids, or other inhomogeneities that act as flaws. Stresses concentrate around filter particles.

18

or flexural strength of a material is defined as its ability to resist deformation under load.

19

During a bending test described in ASTM D790 the maximum achieved flexural stress value is noted as

20

is a number that indicates how much sliding friction there is between two objects for a given normal force pushing them together.

21

factors that can affect the coefficient of friction

22

is the ability of the material to resume its normal shape after being stretched or compressed.

23

is calculated as the ratio of the stress to the corresponding strain in the linear portion of the stress vs. strain or force vs. deformation curve.

24

also known as plastic deformation, is the ability of a solid material to undergo permanent deformation, a non-reversible change of shape in response to applied forces. This property is visible when rice grains are processed into flat rice or oat grains are processed into oat meals

25

In engineering, the transition from elastic behavior to plastic behavior is known

26

relate how the material in motion in air or other gaseous fluids behaves when exposed to the motion of gaseous fluid and the forces acting on it.

27

a dimensionless quantity, is used to quantify the drag or resistance of an object in a fluid environment, such as air or water.

28

associated with a particular surface area

29

is the maximum velocity attainable by an object as it falls through a fluid (air is the most common example). It occurs when the sum of the drag force (Fd) and the buoyancy is equal to the downward force of gravity (FG) acting on the object. Since the net force on the object is zero, the object has zero acceleration.

30

relate how the material in motion immersed in the fluid behaves when exposed to the motion of fluid and the forces acting on it.

31

is a measure of a fluid's resistance to flow. It is a quantity expressing the magnitude of internal friction, as measured by the force per unit area resisting a flow in which parallel layers unit distance apart have unit speed relative to one another.

32

is a measure of a fluid's internal resistance to flow under gravitational forces. It is determined by measuring the time in seconds, required for a fixed volume of fluid to flow a known distance by gravity through a capillary within a calibrated viscometer at a closely controlled temperature.

33

is the ratio of inertial forces to viscous forces. It is a dimensionless number used to categorize the fluids systems in which the effect of viscosity is important in controlling the velocities or the flow pattern of a fluid.

34

that angle which the a material starts to move down on an inclined flat surface due to the pull of gravity

35

The values of stress and strain determined from the tensile test can be plotted as a

36

which represents the maximum value of stress at which the stress-strain curve is linear.

37

which represents the maximum value of stress at which there is no permanent set. Even though the curve is not linear between the proportionality limit and the elastic limit, the material is still elastic in this region and if the load is removed at or below this point the specimen will return to its original length.

38

which represents the value of stress above which the strain will begin to increase rapidly.

39

The stress at the yield point is called the

40

which is the maximum value of stress on the stress-strain diagram.

41

or the break point, which is the point at which the material fails and separates into two pieces

42

is the material’s ability of the material to resume its normal shape after being stretched or compressed.

43

is the material’s ability to undergo permanent deformation a non-reversible change of shape in response to applied forces.

44

is a transition from elastic behavior to plastic behavior.

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