新型土工單軸拉伸試驗裝置的研制及應用
發(fā)布時間：2018-11-01 15:46
【摘要】：針對目前土工單軸拉伸試驗水平的不足,研制了一套新型土工單軸拉伸試驗裝置,該套裝置主要由試樣制備、加載、控制與數(shù)據(jù)采集4個部分組成。試驗裝置通過燕尾槽與雙滑動底板的設計,可以制備不同拉伸段長度的試樣并分別開展相應的單軸拉伸試驗;通過試樣形式與所對應拉伸夾具的設計,解決了試樣端部在拉伸過程中出現(xiàn)的松弛與應力集中問題;通過雙導軌拉伸裝置的設計,避免了試樣在拉伸過程中出現(xiàn)的應力偏心現(xiàn)象;通過雙級變速箱的設計使最小拉伸速率可達到0.001 mm/min,能夠準確描述材料單軸拉伸破壞的演化過程,并能準確測試材料的抗拉強度以及全過程的拉應力-位移關系曲線�；谒兄频脑囼炑b置開展了黏性土的單軸拉伸試驗,試驗結果表明:黏性土的單軸拉伸破壞形式不是純脆性破壞,而是在抗拉強度后存在一個軟化階段,此時仍具有一定的承載能力;隨著試樣拉伸段長度的增大,抗拉強度呈對數(shù)減小,峰值位移呈對數(shù)增大;隨著拉伸速率的增加,抗拉強度呈對數(shù)增加,峰值位移呈線性增加;抗拉強度與峰值位移均隨壓實度的遞增呈線性增加;隨著含水率的遞增,試樣的抗拉強度先增大后減小,即存在一個峰值,而峰值位移呈線性增加。
[Abstract]:In view of the deficiency of the present uniaxial tensile test, a new type of geo-uniaxial tensile test device is developed. The device is mainly composed of four parts: sample preparation, loading, control and data acquisition. Through the design of swallowtail groove and double sliding bottom plate, the specimen with different tensile length can be prepared and the corresponding uniaxial tensile test can be carried out respectively. Through the design of specimen form and the corresponding tensile fixture, the problem of relaxation and stress concentration at the end of the specimen during the tensile process is solved. The stress eccentricity of the specimen during the tensile process is avoided by the design of the double guideway drawing device. Through the design of two-stage gearbox, the minimum tensile rate of 0.001 mm/min, can accurately describe the evolution process of uniaxial tensile failure of the material, and the tensile strength of the material as well as the tensile stress-displacement curve of the whole process can be accurately measured. The uniaxial tensile test of clay is carried out based on the experimental device. The results show that the failure mode of clay under uniaxial tension is not pure brittle failure, but a softening stage after tensile strength. At this time, there is still a certain bearing capacity; With the increase of tensile length, the tensile strength decreases logarithmically and the peak displacement increases logarithmically, and with the increase of tensile rate, the tensile strength increases in logarithm, and the peak displacement increases linearly. The tensile strength and the peak displacement increase linearly with the increase of compaction, and the tensile strength increases first and then decreases with the increase of water content, that is, there is a peak value and the peak displacement increases linearly.
【作者單位】： 南昌工程學院土木與建筑工程學院;江西省水利土木特種加固與安全監(jiān)控工程研究中心;江西省水利土木工程基礎設施安全重點實驗室;南昌航空大學土木建筑學院;河海大學巖土力學與堤壩工程教育部重點實驗室;
【基金】：國家自然科學基金項目(No.51609114) 江西省青年科學基金項目(No.20114BAB216010) 河海大學巖土力學與堤壩工程教育部重點實驗室開放基金項目(No.2016001)~~
【分類號】：TU415
[Abstract]:In view of the deficiency of the present uniaxial tensile test, a new type of geo-uniaxial tensile test device is developed. The device is mainly composed of four parts: sample preparation, loading, control and data acquisition. Through the design of swallowtail groove and double sliding bottom plate, the specimen with different tensile length can be prepared and the corresponding uniaxial tensile test can be carried out respectively. Through the design of specimen form and the corresponding tensile fixture, the problem of relaxation and stress concentration at the end of the specimen during the tensile process is solved. The stress eccentricity of the specimen during the tensile process is avoided by the design of the double guideway drawing device. Through the design of two-stage gearbox, the minimum tensile rate of 0.001 mm/min, can accurately describe the evolution process of uniaxial tensile failure of the material, and the tensile strength of the material as well as the tensile stress-displacement curve of the whole process can be accurately measured. The uniaxial tensile test of clay is carried out based on the experimental device. The results show that the failure mode of clay under uniaxial tension is not pure brittle failure, but a softening stage after tensile strength. At this time, there is still a certain bearing capacity; With the increase of tensile length, the tensile strength decreases logarithmically and the peak displacement increases logarithmically, and with the increase of tensile rate, the tensile strength increases in logarithm, and the peak displacement increases linearly. The tensile strength and the peak displacement increase linearly with the increase of compaction, and the tensile strength increases first and then decreases with the increase of water content, that is, there is a peak value and the peak displacement increases linearly.
【作者單位】： 南昌工程學院土木與建筑工程學院;江西省水利土木特種加固與安全監(jiān)控工程研究中心;江西省水利土木工程基礎設施安全重點實驗室;南昌航空大學土木建筑學院;河海大學巖土力學與堤壩工程教育部重點實驗室;
【基金】：國家自然科學基金項目(No.51609114) 江西省青年科學基金項目(No.20114BAB216010) 河海大學巖土力學與堤壩工程教育部重點實驗室開放基金項目(No.2016001)~~
【分類號】：TU415
【相似文獻】
相關期刊論文 前10條
1 楊吳生;薛明霞;;混凝土單軸拉伸應力-應變?nèi)�試驗方法及裝置[J];工業(yè)建筑;2009年S1期
2 陳健云;白衛(wèi)峰;;考慮動態(tài)應變率效應的混凝土單軸拉伸統(tǒng)計損傷模型[J];巖石力學與工程學報;2007年08期
3 鄧宗才;薛會青;李朋遠;張鵬飛;佘向軍;;高韌性纖維增強水泥基復合材料的單軸拉伸力學性能[J];北京工業(yè)大學學報;2009年09期
4 周寒清;彭剛;陳偉;吳彬;;混凝土細觀尺度下單軸拉伸性能研究[J];人民黃河;2013年04期
5 梁寧慧;劉新榮;孫霽;;多尺度聚丙烯纖維混凝土單軸拉伸試驗[J];重慶大學學報;2012年06期
6 黃大千;余文芳;;LC9鋁合金單軸拉伸形變規(guī)律[J];航空材料;1981年01期
7 王文進,余梁蜀;瀝青砂漿的單軸拉伸蠕變特性[J];西安理工大學學報;1999年01期
8 蔡向榮;徐世p，
本文編號：2304381
本文鏈接：http://www.sikaile.net/jianzhugongchenglunwen/2304381.html
最近更新
教材專著
