| 经历不同高温后砂岩的动态力学特性实验研究 |
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| 引用本文： | 陈腾飞,许金余,刘石,王鹏,方新宇.经历不同高温后砂岩的动态力学特性实验研究[J].爆炸与冲击,2014,34(2):195-201. |
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| 作者姓名： | 陈腾飞 许金余 刘石 王鹏 方新宇 |
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| 作者单位： | 1.空军工程大学工程学院机场建筑工程系，陕西 西安710038 |
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| 基金项目： | 国家自然科学基金项目(51078350,51378497) |
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| 摘 要： | 运用RX3 -20 -12型箱式电阻炉将砂岩试样分别加热至100、200、400、600、800和1 000℃，然后自然冷却至常温，制成经历不同温度的砂岩试件。运用直径为100mm的分离式Hopkinson压杆装置，用薄圆形紫铜片作为波形整形器，以不同弹速轴向冲击砂岩试样，测试经历不同温度后砂岩试样在不同冲击荷载下的动态力学性能，得出了砂岩的应力-应变曲线及各自的破坏形态。结果表明:常温下砂岩的动态压缩破坏的应力-应变曲线具有明显的4阶段特征，但经历100~400℃作用的砂岩应力-应变曲线的平台段消失，温度继续升高时平台段又重新出现；砂岩的峰值应变随温度升高而升高，动态压缩强度也随温度升高而升高，但在800℃以后陡然下降；砂岩的动态压缩破坏形态受温度和冲击荷载的共同影响，冲击荷载越大破碎程度越大，而且破坏过程总是由外层向内芯发展。
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| 关 键 词： | 固体力学 应力-应变曲线 SHPB 砂岩 破坏形态 高温 |
| 收稿时间： | 2012-09-24 |
Experimental study on dynamic mechanical properties of post -high -temperature sandstone |
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| Affiliation: | 1.Department of Airfield and Building Engineering, Engineering College, Air Force Engineering University, Xi'an 710038, Shaanxi, China2.Unit 91531 of PLA, Sanya572000, Hainan, China3.School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi'an 710072, Shaanxi, China |
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| Abstract: | Thesandstonesampleswereheatedattherisingtemperaturerateof10℃/minfrom25℃
to100,200,400,600,800and1000℃,respectively,byusingaRX3-20-12box-typeresistancefurnace.
Theywerebeingkeptatthecorrespondingtemperaturesfor3h.Thentheheatedsandstone
sampleswerenaturallycooledto25℃.Allthesandstonesamplesweredividedintosevengroupsaccordingtothetemperaturesundergonebythem.
Byusingathinredcoppercircularplateasthepulse
shaper,thesandstonesampleswereimpactedbythedifferent-velocityprojectilesdrivenbya100-mmdiametersplitHopkinsonpressurebarsetup.
Andthestress-straincurvesofthesandstonesamples
subjectedtoimpactwereobtainedaswellastheirfailuremodes.Experimentalresultsshowthatthe
stress-straincurvesofthesandstonesamplesatconstanttemperatureobviouslytakeonfourstages,
buttheplatformstagesdisappearinthestress-straincurvesofthesandstonesamplesundergoing100
-400℃andtheyappearagainwhenthetemperaturesundergonebythesandstonesamplescontinue
torise.Asthetemperaturesundergonebythesandstonesamplesrise,theirpeakstrainsandstresses
increase;butwhenthetemperaturesundergoneexceed800 ℃,thepeakstressesfallsuddenly.The
impactloadandtheheattemperaturecanaffectthefailuremodeofsandstone,thebreakdegreeincreaseswiththeincreasingoftheimpactloadandthedamagedevelopsfromtheouterofsandstoneto
thecore. |
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| Keywords: | solidmechanics stress-straincurve SHPB sandstone failuremode post-hightemperature |
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