| 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. doi: 10.11883/1001-1455(2014)02-0195-07 |
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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; 2. 中国人民解放军91531部队，海南 三亚572000; 3. 西北工业大学力学与土木建筑学院，陕西 西安710072 |
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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 |
| 修稿时间： | 2012-11-13 |
Experimental study on dynamic mechanical properties of post -high -temperature sandstone |
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| Teng -fei Chen, Jin -yu Xu, Shi Liu, Peng Wang, Xin -yu Fang. Experimental study on dynamic mechanical properties of post -high -temperature sandstone[J]. Explosion And Shock Waves, 2014, 34(2): 195-201. doi: 10.11883/1001-1455(2014)02-0195-07 |
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| Authors: | Teng -fei Chen Jin -yu Xu Shi Liu Peng Wang Xin -yu Fang |
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| Affiliation: | 1. Department of Airfield and Building Engineering, Engineering College, Air Force Engineering University, Xi'an 710038, Shaanxi, China; 2. Unit 91531 of PLA, Sanya572000, Hainan, China; 3. 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.Thentheheatedsandstonesampleswerenaturallycooledto25℃.Allthesandstonesamplesweredividedintosevengroupsaccordingtothetemperaturesundergonebythem.Byusingathinredcoppercircularplateasthepulseshaper,thesandstonesampleswereimpactedbythedifferent-velocityprojectilesdrivenbya100-mmdiametersplitHopkinsonpressurebarsetup.Andthestress-straincurvesofthesandstonesamplessubjectedtoimpactwereobtainedaswellastheirfailuremodes.Experimentalresultsshowthatthestress-straincurvesofthesandstonesamplesatconstanttemperatureobviouslytakeonfourstages,buttheplatformstagesdisappearinthestress-straincurvesofthesandstonesamplesundergoing100-400℃andtheyappearagainwhenthetemperaturesundergonebythesandstonesamplescontinuetorise.Asthetemperaturesundergonebythesandstonesamplesrise,theirpeakstrainsandstressesincrease;butwhenthetemperaturesundergoneexceed800 ℃,thepeakstressesfallsuddenly.Theimpactloadandtheheattemperaturecanaffectthefailuremodeofsandstone,thebreakdegreeincreaseswiththeincreasingoftheimpactloadandthedamagedevelopsfromtheouterofsandstonetothecore. |
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| Keywords: | solidmechanics stress-straincurve SHPB sandstone failuremode post-hightemperature |
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