Predicting of Process Parameters for Theoretical Concentrated Stress of Fatigue Notch Coefficient of Auto Parts Using Virtual Recognizable Performance Evaluation Research

This paper analyzes the structure of the key parts of the car belt guide, and the average stress of the vulnerable parts is simulated by analysis software. The theoretical stress of the section is calculated. The theoretical stress concentration factor ([Formula: see text]) is given. The relation between the gap radius and the notch coefficient ([Formula: see text]) was studied according to a previous [Formula: see text] calculation formula. The tensile tests of real products are used as reference data. The results showed that [Formula: see text] and [Formula: see text] are linear in most cases, but there are also cases of non-compliance. The relationship between the fatigue notch coefficient [Formula: see text] and the theoretical stress concentration coefficient [Formula: see text] was closely related to the service life and fatigue strength of the product. In addition, we found that the size and direction of warpage improved significantly with the increase of fillet size, which was not consistent with the effect of adding glass fiber material. The rounded corners of ordinary PP materials usually displayed forward warping, but the addition of glass fiber into PP materials made the degree of warping smaller, or even led to reverse warping. The size of rounded corners is an important optimization parameter. The relationship between [Formula: see text] and [Formula: see text] was studied from the perspectives of virtual measurement (VM) and recognizable performance evaluation (RPM). According to abnormal filling pressure, these relationships were compared with filling data to generate a fracture initiation control model. Based on a large amount of normal process data and quality inspection data, the historical data (causes) and quality inspection data (results) were combined.