本文選題：多孔聚合物　切入點：應變率效應　出處：《西南科技大學》2015年碩士論文　論文類型：學位論文

【摘要】：本論文主要研究了多孔聚合物在多因素下的靜動態(tài)力學性能和力-熱耦合響應特性。具體的研究內(nèi)容如下:1、利用三維數(shù)字散斑動態(tài)變形測量分析技術聯(lián)合材料試驗機對硬質(zhì)聚氨酯泡沫塑料RPUR和泡沫硅橡膠SR進行準靜態(tài)拉伸、壓縮實驗,獲得其在不同應變率、不同取樣方向、不同溫度等條件下的力熱響應特性。實驗結果表明:RPUR材料和SR材料在拉伸和壓縮實驗中都具有不太顯著的應變率效應及一定的溫度效應,壓縮試驗中的溫度敏感性要強于拉伸試驗中的溫度敏感性,高密度RPUR對溫度的敏感性強于低密度RPUR的溫度敏感性,且其拉伸強度和屈服應力隨溫度的升高而降低;拉伸試驗和壓縮試驗中試件力學性能都表現(xiàn)為各向異性。SR壓縮實驗中試件尺寸的不同對研究其力學性能幾乎沒有影響;RPUR壓縮試件尺寸的不同對材料的力學行為有顯著影響。拉伸試驗中SR試件因泡孔壁溝槽的產(chǎn)生而破壞,壓縮試驗中試件由于泡孔受力壓潰而出現(xiàn)裂痕;拉伸試驗中RPUR泡孔有明顯的裂紋,壓縮試驗中試件由于泡孔受力完全變形而徹底破壞。2、利用加長式分離式霍普金森桿(SHPB)研究RPU R和SR泡沫材料在高應變率條件下的動態(tài)力學性能。發(fā)現(xiàn)RPUR和SR材料的動態(tài)力學性能不同于靜態(tài)力學性能,其在研究的高應變率范圍內(nèi)應變率效應都不太明顯;而動態(tài)與靜態(tài)條件下的力學性能相比則有明顯的應變率相關性。3、在準靜態(tài)試驗過程中試件內(nèi)部溫度在破壞時達到最高,試件不同位置處的溫度變化情況基本一致。SR的最大溫升較小,可視為是等溫實驗;而RPUR的溫升較大,且升熱速率和最大溫升隨加載速率的增大而增大。
[Abstract]:In this paper, the static and dynamic mechanical properties of porous polymers under multi-factors and the mechanical-thermal coupling response characteristics are studied. The specific contents of the study are as follows: 1. The three-dimensional digital speckle dynamic deformation measurement and analysis technique is used to test the materials. The machine carried out quasi static stretching of rigid polyurethane foam RPUR and silicone rubber foam SR. Compression experiments were performed to obtain different strain rates and different sampling directions. The experimental results show that the strain rate effect and temperature effect of both the W RPUR material and the SR material are not obvious in the tensile and compression tests. The temperature sensitivity of compression test is stronger than that of tensile test. The temperature sensitivity of high density RPUR is stronger than that of low density RPUR, and the tensile strength and yield stress decrease with the increase of temperature. The mechanical properties of the specimens in tensile test and compression test are anisotropic. The difference of specimen size in SR compression test has little effect on the mechanical properties of the material. The mechanical behavior of the material is similar to that of the RPUR compression specimen. Significant effect. In tensile test, SR specimen was destroyed by the formation of bubble hole wall grooves, In the compression test, cracks appeared in the specimens due to the bursting of the bubble holes, while in the tensile tests, there were obvious cracks in the RPUR bubble pores. In the compression test, the specimen was completely destroyed because of the complete deformation of the bubble hole. The dynamic mechanical properties of RPUR and SR foam materials under high strain rate were studied by using the extended split Hopkinson rod SHPB. it was found that the RPUR and SR materials were subjected to high strain rate. The dynamic mechanical properties of the system are different from those of the static mechanical properties, In the range of high strain rate studied, the strain rate effect is not obvious, but the dynamic and static mechanical properties have obvious strain rate correlation. The internal temperature of the specimen reaches the highest in the process of quasi-static test. The maximum temperature rise of SR is small, which can be regarded as isothermal experiment, but the temperature rise of RPUR is larger, and the heating rate and maximum temperature rise increase with the increase of loading rate.
【學位授予單位】：西南科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TB324

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