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MINIMUM SPECIMEN SIZE REQUIREMENTS AND VALIDITY CRITERIA FOR K_(IIC)-TESTS

机译:最小标本尺寸要求和k_(iic)的有效性标准 - 最低

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From a discussion of the sizes of the plastic zones at the tip of a crack under shear (mode-II) and tensile (mode-I) conditions of loading hypotheses on minimum specimen size requirements for the determination of valid values of the shear fracture toughness K_(IIc) are derived. The minimum specimen thickness for a K_(IIc)-test should be smaller, but the minimum inplane specimen dimensions should be larger than for a K_(Ic)-test. Mode-I and mode-II fracture toughnesses are measured for the aluminium alloy 7075 with specimens of different sizes to verify the hypotheses.
机译:从剪切(模式-II)下裂缝尖端的塑料区尺寸的讨论和装载假设的拉伸(Mode-I)条件,以确定剪切断裂韧性的有效值的要求派生K_(IIC)。 K_(IIC) - 最低的最小样本厚度应小于,但最小入口标本尺寸应大于K_(IC)-Test。模式-I和模式-II型骨折韧性为铝合金7075测量具有不同尺寸的标本,以验证假设。

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