Reliability Of Mechanical Products Research Articles

A literature review on the planning and analysis of accelerated degradation testing for mechanical products

High reliability and long life are typical requirements for mechanical products. The performance requirements of mechanical products are increasing as science and technology develop, and the environment and working stress they bear are becoming more diverse. This issue has become one of the bottlenecks for mechanical products in lifespan and reliability generally. The aim of this study is to categorize, examine, and review the most applicable accelerated testing methods for mechanical products. The research status of accelerated modeling methods, statistical analysis, and design optimization of accelerated degradation testing(ADT) technology are reviewed. On the basis of literature analysis, the deficiencies and possible development directions of ADT were summarized and prospected. This work is anticipated to serve as a reference and provide important insights into the reliability of mechanical products.

3D Visualization of Morphological Evolution of Large Defects during Spark Plasma Sintering of Alumina Granules

The mechanical reliability of products must be assured for scaling up and production of complex‐shaped components by spark plasma sintering (SPS) of spray‐dried granules. The evolution of morphologies of pores and defects, which control the mechanical strength, is investigated by using synchrotron X‐ray multiscale tomography during SPS of alumina granules at 1300 °C. While large defects arising from the hierarchical granule packing structure cannot be removed by pressureless sintering, crack‐like defects and branched rodlike defects are almost eliminated by SPS at stresses higher than 30 and 50 MPa, respectively. But, small ellipsoidal porous regions, which may arise from aggregates or dimples of granules, cannot be removed even at a pressure of 50 MPa. A very large defect is also found by using micro‐CT. It is supposed that this defect is formed from a large void in loosely packed granules. The shrinkage of large voids and the elimination of crack‐like defects are explained by the theoretical prediction based on the continuum theory of sintering.

An Assessment of the Quality-Achieving Reliability of Mechanical Products Based on Information-Poor Theory

Abstract Reliable evaluation of a product's quality assurance capability is difficult to quantify due to the intricacies of the quality assurance process and the uncertain relationships between the product quality and its influence factors. To address this problem, with the aid of information-poor theory, a new concept, quality-achieving reliability, is proposed, and a corresponding evaluation model is structured to calculate the probability of achieving product quality as a function of the influence factors. Using the decomposition and composition method, quality classifications of the product evaluation indicator and its influence factors are produced to extract the cumulative distribution of the product quality and its elements. Using the grey relational grade method, a weight analysis of the impacts of the influence factors on the product quality is performed to obtain the status composite values of the influence factors. Under the condition of poor information and relying on the status composite values based on the cumulative distribution, a quality-achieving reliability function is established to reflect the quality assurance capability and quality control level of the product and its elements. An experimental investigation of the vibration acceleration of tapered roller bearings demonstrates the application of the proposed model.

Analysis of the Process Reliability of Machinery Manufacturing

The study design, manufacturing and management make the reliability of the product. The product reliability indicators have clear requirements in the mechanical product design, the manufacturing process of mechanical products through the scientific integration process elements of materials processing becomes a practical product, but also the reliability of mechanical product design stage to achieve the process. Reliability of mechanical products not only has important implications for the design of the product, the manufacturing process to achieve product design reliability only considering the impact of various factors on the reliability of mechanical products, mechanical products, and take measures to control, in order to ensure the reliability of mechanical products.

Statistical characteristics of the mechanical properties of glass-reinforced plastics

A statistical analysis has been made of experimental data on the mechanical properties of a glass-reinforced plastic based on T1 glass fabric (Soviet standard GOST 8481-61) and IF-ED-6 epoxy resin (Elektroizolit Plant, tech. spec. TU 26-59) obtained by testing specimens cut from the waste of wound cylindrical shells. The data obtained can be used for estimating the mechanical reliability of products composed of glass-reinforced plastics of this type.