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Breakage behavior of gravel rock particles under impact force
Computational Particle Mechanics ( IF 3.3 ) Pub Date : 2021-02-25 , DOI: 10.1007/s40571-021-00393-2
Honghua Zhao , Cong Liu , Jin Zhang , Louis Ge

To investigate the rock particle breakage behavior subject to impact load, a series of split Hopkinson pressure bar (SHPB) tests were conducted on selected Nishan rock and Shoushan rock particles within gravel size range at different strain rates. Both rock particles exhibit a typical strain softening macrobehavior and their dynamic peak strengths increase with strain rate. A dynamic increasing factor (DIF) is used to describe this strain rate effect. Based on the SHPB test, a constitutive model is proposed for the two types of rock particles to describe their dynamic stress–strain behavior considering strain rate effect and damaging effect. Grain size distribution of fractured rock particles was analyzed, which reflected the fragmentation characteristics quantitatively. A fractal theory was used to describe the fragmentation characteristics and dynamic strength of both types of rock particles. Dynamic strength was found to vary differently with fractal dimension for Nishan rock and Shoushan rock.



中文翻译:

冲击力作用下砾石颗粒的破坏行为

为了研究冲击载荷作用下岩石颗粒的破碎行为,在不同应变率下,对碎石粒度范围内的选定Nishan岩石和Shoushan岩石颗粒进行了一系列的霍普金森压力棒(SHPB)测试。两种岩石颗粒均表现出典型的应变软化宏观行为,并且其动态峰值强度随应变速率而增加。动态增加因子(DIF)用于描述这种应变率效应。在SHPB试验的基础上,针对两种类型的岩石颗粒,提出了本构模型,描述了考虑应变速率效应和破坏效应的动应力-应变行为。分析了裂隙岩石颗粒的粒度分布,定量地反映了破碎特征。分形理论被用来描述两种类型岩石颗粒的破碎特性和动态强度。发现尼山岩和寿山岩的动强度随分形维数而变化。

更新日期:2021-02-25
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