SHPB试验中不同加载升时应力平衡时间对波阻抗比的敏感性

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Abstract Rectangular wave，trapezoidal wave and sloping wave were expressed as trapezoidal wave with different rising times to analyze the sensitivity of time for stress equilibrium to wave impedance ratio in split Hopkinson pressure bar(SHPB) tests. Based on one-dimensional stress wave theory，propagation of incident stress wave in specimen，was analyzed and related calculation formulas for stress distribution along loading direction were obtained under trapezoidal wave with different rising times. Variation curves of time for stress equilibrium and stress uniformity were calculated under trapezoidal wave with different rising times and different specimen-bar wave impedance ratios. Several trapezoidal wave parameters affecting time for stress equilibrium and stress uniformity，such as rising time and specimen-bar wave impedance ratio，were studied；and some useful conclusions were also obtained. Research results can provide a theoretical basis for SHPB experimental designs and related analyses.

Key words： solid mechanics one-dimensional stress wave time for stress equilibrium stress uniformity rising time for loading wave impedance ratio split Hopkinson pressure bar(SHPB)

Received: 31 December 2012

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http://www.rockmech.org/EN/Y2013/V32/I10/2128

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