(一) 前言为了进一步了解整体薄壁球铁活塞在运用中的应力状态,摸清活塞结构的薄弱环节,为活塞结构的逐步完善提供依据。从1979年开始,我们对16240Z型柴油机的整体薄壁球铁活塞工作状态下的应力开展了测试研究工作。通过对活塞内壁工作状态下的应力测试,成功地解决了应变片引出线由活塞过渡到连杆的引线装置,从而可用直接引线法将运动活塞上 (A) Preface In order to further understand the overall state of the thin-walled ductile iron piston in the use of stress state, find out the weak link of the piston structure for the gradual improvement of the piston structure to provide the basis. Since 1979, we have carried out test research on the stress of the integral thin-walled ductile iron piston of 16240Z diesel engine. Through the stress test under the working condition of the inner wall of the piston, the lead device of the strain gauge leading-out line from the piston to the connecting rod is successfully solved, and the direct acting lead method can be used to move the moving piston