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摘要: 根据无烟煤破坏以拉应力破坏、张应变破坏和卸载破坏等组合形式为主、压剪破坏出现的几率很 小的特征,提出了无烟煤的压缩膨胀拉伸破坏模型,并在能量平衡原理和断裂理论的基础上,推导了该模型的 动态强度理论计算关系式,确定了动力学参数之间的定量关系。利用导出的强度公式,对无烟煤的抗压强度 进行了计算,计算结果与已有的实验结果较好吻合。这表明,该公式能够用来预测无烟煤在单轴冲击载荷作 用下的极值强度,揭示无烟煤这种多孔隙介质在冲击载荷作用下的破坏机理。
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关键词:
- 固体力学|强度模型|SHPB实验|无烟煤 /
- 动态强度
Abstract: Basedontheexistentinvestigationsthatthemainfailurepatternofanthraciteunderuniaxial impactloadingisthecombineddamageoftensilestressdamage,extensiblestraindamageandunloadingdamage, butcompression-shearingdamageisinfrequent,acompression-extension-tensiondamagemodelwasproposedtoanalyzetheimpact- inducedfractureinanthracite.Andaccordingtotheenergybalanceprincipleandthefracturetheory, thetheoreticalformulaforcalculationofthedynamic strengthintheproposedmodelwasdeducedtodeterminethequantitativerelationshipbetweentherelateddynamicparametersofanthracite. Aseriesofcompressivestrengthsofanthracitewerecalculatedbythededucedformula. Comparisonsshowthatthecalculatedresultsareinagreementwiththe existentmeasuredones.Sothededucedformulacanbeusedtoestimatetheextremestrengthofanthraciteunderuniaxialimpactloadinganditcanrevealthedamagemechanism fanthracite-likeporousmediaunderimpactloading.-
Key words:
- solidmechanics /
- strengthmodel
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