爆破荷载作用下透明脆性材料的三维裂纹扩展行为

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中图分类号：O382.2；TJ301 国标学科代码：1303520；44035 文献标志码：A

Three-dimensional crack propagation behaviors transparent brittle materials under blasting load

TAO Zihao1²，LI Xianglong1²，WANG Jianguo1²，HU Qiwen1²， ZUO Ting1²，HU Tao12 （1. ， ， ， ， 2. Department， ， ， China）

Abstract：Thecrackpropagationbehaviorbritlematerials，suchasrock，istenchalenging tocaptureunderexplosive loading conditions.To addressthis issue，model experiments were conducted based on the theory explosive damage， utilizing transparent polymethyl methacrylateas a surogate material to simulate the fracture response britle materials. High-speed photography computed tomographyscaning were employed to investigate the dynamic fracture proces three-dimensionalcrack evolutionunderblastloading.Inaddition，3Dscaning technologywasusedtoreconstructthe morphology cracks characterize the fracture surface features.The results indicate that under the sustained action multi-stage explosiveenergy，racksundergorepeatedinitiation propagationInitialcracksinducedbyshockwavesehibit highdensitya“fishscale”patem，primarilyconcentratedaroundtheblasthole.Incontrast，secondarycracksdrivenby detonation gases have alower density extend outward in“ear-shaped”or“dagger-shaped”forms.As the distance from the explosioncenter increases，thecrack surface morphologytransitions fromrugged tomicrowave-liketextures，with mproved flatnessSpecifically，theelevationvariancethefracturesurfacedecreases from0.796to0.586，whilethemaximumheight reduces from 3.2mm to 2.8mm ，representing a 12.5% reduction. Moreover， the failure mode the material shifts from compressive-sheartotensilefailurewithincreasingdistancefromtheexplosioncenter.Thisshiftisaccompaniedbyadecline inboth the fractal dimension the crackdistribution the overalldamage degree the model.

Keywords：britle materials;blasting load;dynamic fracture;three-dimensional crack;topographical feature

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