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Find the atomic packing factor for the given unit cell.

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APF= volume of atoms in a unit cell/total unit cell volume

93. What is the sample which is characterized by the highest module of elasticity?

94. What is the direction of slip for the dislocation shown in the figure?

95. The failure of three samples happened at the same load. Which of these samples has the highest ultimate strength?

96. This is elastic deformation. What is the material of the samples?

97. What is the yield strength of the material?

The stress at which a material exhibits a specified deviation from proportionality of stress and strain. An offset of 0.2% is used for many materials, particularly metals.

98. Which material has the highest module of elasticity? Determine its value. diamond 800-1200

99. There are three rods of the same length made from three different materials. Their mechanical behaviors are represented by three different curves in the graph. What is the material from which the longest wire can be drawn?

100. It is necessary to provide the maximum flight-shot (максимальная дальность полета стрелы). Choose the material for the bowstring of the arbalest (арбалет). ALUMINIUM

Four rods having the same area of cross section and length are gripped from one end. The gravity induces only elastic deformation. Find the material of the rod which gets the minimum length.

102. Two samples from different materials were stretched for the same strain and then unloaded. Which sample became longer?

103. There are indentation marks on the surface of three different materials made by steel ball. Which material has the highest ultimate tensile strength?

In tensile testing, the ratio of maximum load to original cross-sectional area. Also called ultimate strength

104. The sample was loaded beyond the yield point and then unloaded as shown by curve 1. Which curve shows the behavior of that material after second loading?

105. Figure A shows the sample from low-carbon steel fractured during tension test at room temperature. What is the shape of sample from the same material after fracture at -50oC?

106. Find the material with the highest fracture energy?

A)

B)

C)

D) – they all have the same amount of fracture energy

107. Left figure demonstrates cooling curve of the alloy. Find the composition of this alloy using phase diagram.

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Choose the right description of a screw dislocation| Комментарии сертифицированного мануального терапевта, Мэг Робинсон
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