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METHOD FOR TESTING THE FRACTURE SPLITTABILITY OF FORGED STEEL CONNECTING RODS

机译：用于测试锻钢连杆的断裂分裂性的方法

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Connecting rods for the latest design of internal combustion engines require progressively higher fatigue strength and an economical means for manufacture. Modern steel connecting rods are being produced as a single forging followed by fracture splitting to separate the cap from the rod. Steel composition and forging process variables have been shown to affect the fracture splitting characteristics as well as machinability and final part strength. Alloying and processing factors have continued to evolve as driven by the need for performance improvement and cost reduction. A laboratory test was developed to assess the fracture splitting characteristics on small quantity laboratory processed lots to aid in the development of splittable steel compositions and forging process controls. The test consists of a high strain rate tensile test utilizing notched specimens, and results include measurement of fracture load, fracture mode, and specimen deformation. Test results are compared to fracture on a production connecting rod and fractures of material with various characteristics exhibited in standard Charpy V-notch impact tests.
机译：用于最新内燃机的最新设计的连接杆需要逐渐提高疲劳强度和制造的经济手段。现代钢连接杆正在制成作为单一锻造，然后是断裂分裂，以将盖子与杆分离。已显示钢组成和锻造工艺变量影响断裂分裂特性以及可加工性和最终部件强度。由于需要提高和降低成本的需求，合金化和处理因素继续发展。开发了一种实验室测试，以评估小型实验室处理批次的断裂分裂特性，以帮助开发可分裂钢组合物和锻造过程控制。该测试包括利用缺口样本的高应变率拉伸试验，结果包括裂缝载荷，断裂模式和样品变形的测量。将测试结果与裂缝进行比较，在标准夏比V-Notch撞击试验中显示出具有各种特性的材料骨折。

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