湿热耦合作用对聚脲静动态拉伸力学性能的影响规律  

Impact of Moisture-Heat Coupling on the Static-Dynamic Tensile Mechanical Properties of Polyurea

作　　者：程瑜 宋睿 郭辉[1] 陈玉[1] CHENG Yu;SONG Rui;GUO Hui;CHEN Yu(School of Civil Engineering and Architecture,Southwest University of Science and Technology,Sichuan Mianyang 621010,China)

机构地区：[1]西南科技大学土木工程与建筑学院,四川绵阳621010

出　　处：《包装工程》2024年第23期268-275,共8页Packaging Engineering

基　　金：国家自然科学基金面上项目(12272330);西南科技大学研究生创新基金(24ycx1125)。

摘　　要：目的聚脲作为新型的绿色环保防护材料,具有力学性能良好、施工便捷、适应性广及防渗、抗冲磨能力强等优良特性。以聚脲材料为研究对象,分析湿热处理后聚脲材料的力学特性。方法本文拟使用100%湿度下不同温度处理后的聚脲材料,利用GL-028型万能试验机对其做准静态拉伸试验,利用分离式霍普金森拉杆(SHTB)对其做动态拉伸实验,得到了不同应变率下聚脲材料应力-应变曲线。结果聚脲试件经过30、40、50和60℃湿热耦合作用后与20℃湿热耦合相比,在准静态拉伸作用下分别降低0.11%、0.21%、0.26%和0.31%,应力-应变曲线表现出明显的非线性特性:初始线弹性阶段、高弹性阶段和密实阶段;在动态拉伸作用下减少3.5%、10.6%、12.5%和16.6%。因为应力波在传播过程中能量不断减少,聚脲的应变硬化率与准静态不同,呈现递减硬化的特性,形成应力波弥散现象。结论实验结果表明,该聚脲材料防护性能优异,随温度升高,其力学性能下降幅度小,具有良好的耐湿热性。As a new type of green and environmentally friendly protective material,Polyurea exhibits excellent properties including good mechanical properties,easy application,broad adaptability,strong impermeability,and high abrasion resistance.The work aims to focus on analyzing the mechanical properties of polyurea materials subject to moisture and heat treatment.Quasi-static tensile tests were conducted on polyurethane materials treated at different temperatures under 100%humidity by the GL-028 universal testing machine and the Split-Hopkinson Pressure Bar(SHPB)was used to perform dynamic tensile tests.The stress-strain curves of the polyurethane materials at different strain rates were obtained.Compared to the 20℃moisture and heat coupling condition,the mechanical properties of polyurea specimens treated at 30,40,50,and 60℃decreased by 0.11%,0.21%,0.26%,and 0.31%respectively under quasi-static tensile conditions.The stress-strain curves of polyurea displayed significant non-linear characteristics,including initial linear elastic stage,high elastic stage,and densification stage.Under dynamic tensile conditions,the reduction in mechanical properties was 3.5%,10.6%,12.5%,and 16.6%respectively.Due to the continuous decrease in energy during stress wave propagation,the strain hardening rate of polyurea under dynamic conditions differed from that under quasi-static conditions,showing a decreasing hardening characteristic and stress wave dispersion phenomenon.The experimental results indicate that the polyurea material has excellent protective performance and its mechanical properties show a relatively small decrease with the increasing temperature,demonstrating good moisture and heat resistance.

关 键 词：聚脲 湿热耦合 力学性能 应变率 

分 类 号：TB34[一般工业技术—材料科学与工程]