本文選題：固體力學(xué) + 動(dòng)態(tài)壓縮��； 參考：《爆炸與沖擊》2016年01期

【摘要】：采用離散元方法,構(gòu)建了考慮PBX炸藥晶體顆粒與黏結(jié)劑非均勻性的計(jì)算模型,通過在炸藥試樣兩端采用相向飛片加載、將原SHPB實(shí)驗(yàn)的應(yīng)力邊界替代為速度邊界的方法,開展了PBX炸藥的動(dòng)態(tài)壓縮數(shù)值模擬研究,再現(xiàn)了考慮PBX炸藥非均質(zhì)特性的SHPB實(shí)驗(yàn)過程,獲得了不同加-卸載路徑下炸藥應(yīng)力應(yīng)變曲線以及相應(yīng)的損傷破壞圖像。模擬結(jié)果表明:在動(dòng)態(tài)壓縮過程中,雖然PBX炸藥處于整體應(yīng)力平衡,由于PBX高度非均質(zhì)性,內(nèi)部應(yīng)力分布并不均勻,晶體間應(yīng)力以應(yīng)力橋形式傳遞;應(yīng)力曲線為試樣整體平均,試樣內(nèi)局部所受真實(shí)應(yīng)力可能高于曲線峰值應(yīng)力;出現(xiàn)卸載回滯曲線的試樣發(fā)生局部損傷破壞,而完全軟化曲線的試樣發(fā)生整體失穩(wěn)破壞。
[Abstract]:Using discrete element method, a calculation model considering the heterogeneity between PBX explosive crystal particles and binder is established. The stress boundary of the original SHPB experiment is replaced by the velocity boundary method by loading the two ends of the explosive sample with the opposite flyer. The dynamic compression numerical simulation of PBX explosives was carried out, and the experimental process of SHPB considering the heterogeneity of PBX explosives was reappeared. The stress-strain curves and damage images of PBX explosives under different loading and unloading paths were obtained. The simulation results show that, although PBX explosives are in a global stress balance during dynamic compression, due to the high heterogeneity of PBX, the internal stress distribution is not uniform, the stress between crystals is transmitted in the form of stress bridge, and the stress curve is the overall average of the sample. The local true stress in the specimen may be higher than the peak stress of the curve, and the specimen with unloading hysteresis curve may have local damage and failure, while the specimen with complete softening curve will have the whole instability failure.
【作者單位】： 中國工程物理研究院流體物理研究所沖擊波物理與爆轟物理重點(diǎn)實(shí)驗(yàn)室;南京理工大學(xué)化工學(xué)院;中國工程物理研究院;
【基金】：國家自然科學(xué)基金項(xiàng)目(11272294,11272296) 中國工程物理研究院科學(xué)技術(shù)發(fā)展重點(diǎn)基金項(xiàng)目(2012A0201007) 沖擊波物理與爆轟物理重點(diǎn)實(shí)驗(yàn)室專項(xiàng)項(xiàng)目(2012-專-05)
【分類號(hào)】：TQ560.1;O38

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本文編號(hào)：2010239