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本文在单轴取向假定的基础上,用定伸强力表征石棉/NBR和石棉/EPDM两种绝热材料的杨氏模量,用摆动圆盘硫化仪参数最大扭矩表征它们的高温剪切模量,得到了一些初步的结果。实验表明,高石棉填充橡胶的纵向杨氏模量比横向模量大数倍。石棉/NBR与石棉/EPDM的纵向杨氏模量比在2.2左右,高温纵向剪切模量比接近2.5。发动机内绝热层的实际E_L/E_T比值取决于石棉纤维的含量、纤维尺寸以及炼胶和压片工艺等因素。石棉/NBR的最大E_L/E_T可达到10。石棉/NBR和石棉/EPDM的横向杨氏模量比和纤维体积含量无关,接近无石棉橡胶的模量比,
Based on the assumption of uniaxial orientation, the Young’s modulus of asbestos / NBR and asbestos / EPDM insulation materials are characterized by tensile strength, and their high temperature shear modulus is characterized by the maximum torque of swing disk vulcanizer. Got some preliminary results. Experiments show that asbestos-filled rubber has a longitudinal Young’s modulus that is several times greater than the transverse modulus. The Young’s modulus ratio of asbestos / NBR and asbestos / EPDM is about 2.2, and the ratio of longitudinal shear modulus at high temperature is close to 2.5. The actual E_L / E_T ratio of the engine insulation depends on the asbestos fiber content, the fiber size, and the process of compounding and tableting. Asbestos / NBR maximum E_L / E_T up to 10. The transverse Young’s modulus ratio of asbestos / NBR and asbestos / EPDM has nothing to do with the fiber volume content, which is close to that of asbestos-free rubber,