CAJ | 학술논문

为认识载荷脉宽对圆柱壳瞬态响应及其对X射线冲击响应模拟等效性的影响规律，定义了等效性评价指标即平均应变差异。以四种不同尺寸的典型圆柱壳为对象，分别加载六种冲量相同、脉宽不同的三角形脉冲载荷，通过数值模拟，获得了平均应变差异Δε随脉宽变化的关系，从结构特性角度分析了变化的原因。发现Δε主要受t／τ（脉宽占比）控制， t／τ≤0．45时，平均应变差异在20％以内。所得结果可为模拟X射线冲击环境的试验设计、结果评估和数值模拟提供参考。
위인식재하맥관대원주각순태향응급기대X사선충격향응모의등효성적영향규률，정의료등효성평개지표즉평균응변차이。이사충불동척촌적전형원주각위대상，분별가재륙충충량상동、맥관불동적삼각형맥충재하，통과수치모의，획득료평균응변차이Δε수맥관변화적관계，종결구특성각도분석료변화적원인。발현Δε주요수t／τ（맥관점비）공제， t／τ≤0．45시，평균응변차이재20％이내。소득결과가위모의X사선충격배경적시험설계、결과평고화수치모의제공삼고。
In order to understand the influence of load's pulse duration on transient responses of cylindrical shells and fidelity of simulating X-ray shock responses,the average strain difference,namely,the simulating fidelity evaluation index,was defined.Six triangular pulse loads with the same impulse but different pulse durations were exerted on four cylindrical shells with different sizes.The relation of average strain difference Δεwith varying pulse duration was obtained using numerical simulations.The variation cause was discussed from view point of structural characteristics.It was found that the average strain difference Δεis mainly controlled by t/τ(the ratio between the load pulse duration and the time of stress wave propagating along the circumference of cylindrical shell);when t/τ≤0.45,the average strain difference is less than 20%.The results provided a reference for design and evaluation of test simulations of X-ray shock responses and relevant numerical simulations.