动态热机械分析仪(DMA)的静态测试(TMA)应用 二维码
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动态热机械分析仪(DMA)的静态测试(TMA)应用 本章就动态热机械分析仪静态测试(TMA)功能进行讨论。传统观念认为静态测试用TMA设备更好,实际上高端动态热机械分析仪的静态测试功能十分完善,无论是传感器精度和软件功能足以完成和分析所有静态测试和数据处理。重复性和准确度大家拭目以待。 下面如图所示:我们以测试材料PE和PEX为例,进行讨论 测试设备:DMA25 主要研究内容: 1静态测试(TMA):TG玻璃化温度 升温速率:10℃/min - range:-150to 25 静态力:0.02N 2静态测试(TMA):拉伸模式-蠕变测试 温度:100℃ 力值: 0.02N-10min 0.5N-60min 蠕变时间:30min 3静态测试(TMA):压缩模式-蠕变测试 Temp:100℃0.02N-10min0.5N-60min 样品: (1)PE: Height H = 15mm x Width L = 6.1 x Thickness E = 1.75 (2)PEX: Height H = 15mm x Width L = 6.2 x Thickness E = 1.6
静态力:o F = 0.02N application time: 600so F = 0.5N application time: 3600so F = 25N application time 1800s 温度: 100°C 软件: DYNATEST 6.93 设备: DMA25
样品夹具:DMA25拉伸夹具 测试过程描述: 在同一温度下对样品在不同时间段施加从低到高的静态力 1.1样品PE 静态力幅值控制在以下范围内 F = 2E-2 N ± 1.5E-3 N (cf. figure 3)F = 5E-1 N ± 2.3E-3 N (cf. figure 4)F = 25N ± 2.7E-3 N (cf. figure 5) 测试在25N下给材料施加的静态力是2.4Mpa,测试试验30min后的静态应变是0.046 (i.e. 4.6%) (cf. figure 6). Figure 3: PE样品,静态位移statD ,静态力statF与时间关系曲线,温度为100度 Figure 4: PE样品 F=0.5N 在100度下 静态位移STATD 静态力 statF 与时间关系曲线, Figure 5 PE样品 F=25N 100度下静态位移STATD 静态力 statF 与时间关系曲线, Figure 6: 静态应变和静态应力与时间关系曲线
1.2PEX 静态力控制范围: F = 2E-2 N ± 2.2E-3 N (cf. figure 7)F = 5E-1 N ± 2.3E-3 N (cf. figure 8)F = 25N ± 3.5E-4 N (cf. figure 9) 测试在25N下的静压力为statC = 2.5 MPa ,30min后的静态应变为0.073sStrain = 0.073 (i.e. 7.3%) (cf. figure 10). Figure 7: Specimen S2 – F = 0.02N - Static displacement statD and static force statF vs. time @ 100° Figure 8: Specimen S2 – F = 0.5N - Static displacement statD and static force statF vs. time @ 100°C Figure 9: Specimen S2 – F = 25N - Static displacement statD and static force statF vs. time @ 100°C Figure 10: Specimen S2 – Static strain sStrain and static stress statC vs. time @ 100°C |