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车轮损坏的潜在原因是拉伸应力过大,以前,还没有完备的设备检测这种应力,因而美国联邦铁路局安全规则规定,凡是热色变从轮辋至辐板超过4in(lin=25.4mm)的贷车车轮必须报废。西南研究所经10余年研究推出一种噪声分析仪。1982年,用这种仪器在伯林顿Havelock车轮车间成功地对34个新轮、102个热色变轮和40个运用轮进行了对比检测,其后又对其中50个热色变车轮进行锯割验证。结果表明上述规定缺乏科学性,在所有被列为报废的热色变车轮中,只有16个达到报废要求,其余的86个则仍在安全范围之内。
The potential cause of wheel damage is excessive tensile stress. Previously, no complete equipment was available to detect this stress. Therefore, the Federal Railway Administration’s safety rules stipulate that all thermal color changes from the rim to the web exceed 4 in. (Lin = 25.4 mm) The car wheels must be scrapped. Southwest Research Institute launched more than 10 years after a noise analyzer. In 1982, 34 new wheels, 102 thermochromic wheels and 40 operational wheels were successfully tested with this instrument at the Havelock Wheel Shop in Burlington. Fifty of the thermochromic wheels were subsequently tested Sawing validation The results showed that the above provisions were scientifically deficient. Only 16 out of all discarded hot-color wheels met the scrapping requirements, while the remaining 86 were still under safety.