【摘要】 取相同跨高比且直径相近的荆条试样用不同方法、在不同工艺条件下进行软化处理,测试荆条试样的纵向抗弯强度、最大弯曲挠度、弹性模量等力学指标,以探讨最适软化工艺条件。结果表明:1)在水煮,100℃条件下,荆条处理2.5h时,其弯曲挠度最大,软化效果最佳。2)用10%碳酸氢钠溶液、100℃处理荆条75min,其抗弯弹性模量最小,软化效果最佳。3)用10%乙二胺溶液、60℃处理荆条1.5h,其弯曲挠度最大,软化效果最佳。4)用20%尿素溶液、100℃,处理荆条1.5h,其弯曲挠度最大,抗弯弹模最小,软化效果最佳。4种软化处理方法尿素处理方法软化效果最佳,其次是乙二胺处理方法。更多还原

【Abstract】 In order to search the Longitudinal bending performance of Vitex negundo twigs which being softened with different physical and chemical methods,and find out the best way to soften,mechanical properties such as bending strength,maximum bending deflection and modulus of elasticity of the twigs which in the same span to diameter ratio and the similar diameter softened in different methods and different conditions were tested.The results indicated that 1)when the temperature was 100℃,treated with water for 2.5h,the maximum bending deflection was the largest.2)When the temperature was 100 ℃,treated with10% NaHCO3 solution for 75 min,the bending elastic modulus was minimum.3)When the temperature was 60 ℃,treated with 10% ethylene diamine solution for 1.5h,the maximum bending deflection was the largest.4)When the temperature was 100℃,treated with 20% urea solution for 1.5h,the bending deflection was the largest and the modulus of elasticity was minimum,which was the best softening condition.更多还原