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小貨車板簧. 疲勞壽命不夠, 做破損原因分析. Leaf spring. Submitted to LeoMet for failure analysis because of a premature failure.

 

A B C

 

D

 

下:以牙刷清洗+乾燥後. Above: fracture surface covered with rust. Below: fracture surface cleaned with a tooth brush and dried. Fatigue fracture indicated by very vague  beach marks originated from point O in photo C. It takes an experienced eye to see the vague beach marks.

E

 

下:這是另一塊破斷面. 拉伸側是起裂側; 壓縮側是終裂側.破損分析的工作是找出起裂點, 再探討為何從此處起裂? 如何防止下批生產的機件不再悲劇重演?. Fracture surface of another leaf spring.

F

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