strength-weight ratio

The addition of polypropylene fiber decreases the shrinkage ratio of mortar and increases its tensile strength, crack energy, and the max strain, i.e. its toughness rises and brittleness falls.

聚丙烯纤维使水泥砂浆收缩率降低，抗折强度／抗压强度提高，最大变形量与断裂能增大，即使砂浆韧性提高、脆性降低。

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The pipeline steel with strain-based design is usually characterized by high initial work hardening rate, good ductility, and low yield stress to tensile strength ratio.

抗大变形管线钢就是基于应变设计的方法得到的具有连续屈服、较低的屈强比、较高的加工硬化指数以及均匀塑性变形延伸率等特性的管线钢。

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The tensile modulus and strength of the microfibrillar composites are significantly enhanced with increasing the hot stretching ratio, indicating that the microfibers have a good reinforcement on the PET/ PE composites.

复合材料的拉伸模量和拉伸强度随拉伸比增加显著增加，表明微纤化对材料具有良好的增强效果；

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With increase of the mass ratio of drug, tensile strength and break elongation of the membrane decreased from 28.4 MPa to 20.2 MPa and from 38.6% to 4.4% respectively.

随着膜中药物含量的增加，药物膜的拉伸强度，断裂伸长率均下降，分别从284MPa降至202MPa，386%降至44%。

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The yield strength, yield tensile ratio and toughness are major quality indexes of steel pipe ( board). However, it is quite difficult to determine them reasonably.

屈服强度、屈强比、韧性等是钢管（板）的主要质量指标，合理确定这些指标的数值有相当难度。

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