岩石SHPB实验加载过程中应力平衡问题分析

平琦; 马芹永; 袁璞

doi:10.11883/1001-1455(2013)06-0655-07

岩石SHPB实验加载过程中应力平衡问题分析

doi: 10.11883/1001-1455(2013)06-0655-07

1.
安徽理工大学矿山地下工程教育部工程研究中心,安徽淮南232001;
2.
安徽理工大学煤矿安全高效开采省部共建教育部重点实验室,安徽淮南232001

详细信息

通讯作者:
马芹永

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出版历程
- 刊出日期: 2013-11-25

Stressequilibriuminrockspecimenduring theloadingprocessofSHPBexperiment

1.
MinistryofEducation’sEngineeringResearchCenterof MineUndergroundProjects,
2.
AnhuiUniversityofScienceandTechnology,Huainan,Anhui232001,China;

More Information

Corresponding author: MaQin-yong

摘要

摘要: 运用一维应力波理论,分析了弹性应力波在分离式Hopkinson压杆(SHPB)实验中的传播过程,推导出试件和压杆中应力分布相关计算公式。探讨了有关因素对试件应力平衡时间的影响规律,发现试件应力平衡时间受试件/压杆广义波阻抗比和入射加载升时的影响显著,而不受试件/压杆截面积比和入射加载应力幅值的影响。结合岩石SHPB实验,计算分析了不同入射加载应力幅值在不同入射加载升时情况下,试件达到应力平衡时的应变变化特征,并提出了降低试件在应力平衡时的应变控制方法,使试件在未达到断裂应变之前达到应力平衡,以保证实验的有效性。得出的结论对岩石类脆性材料SHPB实验方案设计具有一定的参考意义。
- 固体力学|应力平衡 /
- 应力均匀性|断裂应变|分离式Hopkinson压杆(SHPB)
Abstract: Basedontheone-dimensionalstresswavetheory,theelasticstresswavepropagationinthe splitHopkinsonpressurebar(SHPB)experimentwasanalyzedandthecalculationformulaforthe stressdistributioninthespecimenandthepressurebarwasobtained.Andsomefactorsinfluencing thetimeforthestressequilibriumwerediscussed.Theresultsshowthatthetimeforthestressequilibriumismarkedlyaffectedbythenominalspecimen- to-barimpedanceratioandtheincidentwaverisingtimeandhasnorelevancewiththespecimen- to-barsectionarearatioandtheincidentwavestress amplitude.BycombiningwiththeSHPBexperiment,thestrainchangecharacteristicsoftherock specimensachievingstressequilibrium wereinvestigatedfordifferentincidentstressamplitudesand variousincidentrisingtimes.Andsomemethodsforreducingstrainwereputforwardtomakesure thespecimenachievestressequilibriumbeforefracturetoensurethetestsvalid.TheconclusionsobtainedcanprovidesomereferencesforthedesignoftheSHPBexperimentsonbrittlematerialslike rock.
- solidmechanics /
- stressequilibrium