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对采用并列连杆的5种搭叠曲轴每种的一节环氧树脂模型施加纯扭转或纯弯曲负荷，所考虑的弯曲应力是由连杆力的径向和切向分量产生的，另外，还考虑了纯径向弯曲以及由于主轴颈位移造成的径向弯曲。光弹冻结应力循环之后，测定了曲柄销和主轴颈圆角的变形和应力。确定了高应力的圆角区表面的主应力。在曲柄销和主轴颈的每一个角位，获取了最大主应力的大小、子午线位置及方向。在扭转条件下，这些最大值与角位的关系相当固定，而在弯曲条件下，则如同简支架受弯一样，呈线性改变。试验结果用基于与曲柄销等直径的棒料标称应力的应力集中系数表示。
Applying a pure torsion or a pure bending load to one epoxy model for each of the five overlapping crankshafts with parallel links, the bending stresses considered are due to the radial and tangential components of the link force. In addition, Pure radial bending as well as radial bending due to primary journal displacement are also considered. After the photoelastic freeze stress cycle, the deformation and stress of the crank pin and the spindle fillet were measured. The principal stress on the surface of fillet area with high stress is confirmed. At each of the crankpin and journal journals, the magnitude of maximum principal stress, meridian position, and direction are obtained. Under twisting conditions, these maximums are fairly constant in relation to the angular position, whereas in the bending condition, they change linearly as in the case of a simple stent. The test results are expressed in terms of the stress concentration factor based on the nominal stress of the bar stock with the diameter of the crankpin.