Abstract
Critical acceleration of inside product should be identified numerically for optimized package. JIS has a testing method for shock strength of product as Damage Boundary Curve, DBC, that requires multi-specimen and a specialized shock machine can generate the trapezoidal pulse. However this method is not spread widely due to their complex testing method. This paper considered a simple test method with single specimen only using the half-sine shock pulse.
In this method, to reduce the number of specimen, the critical velocity change test was skipped. Instead of this test, the lowest value of critical velocity change in the practical range was applied to estimate DBC with more severe condition. Calculation method of DBC was considered using the natural frequency and the response acceleration of fragility part that calculated by the shock response spectrum with half sine pulse at the critical acceleration and critical velocity change. Suitable critical acceleration can be determined by derived DBC and the drop height of package drop test. Moreover, to lead the safest critical acceleration that can withstand toward any kinds of shock pulse, the calculation method was considered using the DBC by square shock pulse
