拉伸强度和硬度随外壳厚度比增加而增加。
Tensile strength and stiffness increase as skin thickness ratio increases.
质量好的铸铁井盖是要看其韧度和硬度的。
Cast iron manhole cover of good quality is to see its toughness and hardness.
纤维可占材料体积的三分之一以极大改善材料的强度和硬度。
The fibers can occupy up to one third of the material volume to considerably improve the material strength and stiffness.
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