基于耗散磨损模型的典型机械密封配副混合润滑磨损加速试验研究

随着对产品可靠性和使用寿命要求的不断提高，对产品进行寿命测量试验的时间和经济成本不断提高. 因此，出现了加速寿命试验(ALT)及在此基础上的加速退化试验(ADT)，通过高应力水平下的加速试验数据来估计产品正常应力水平下的可靠性和寿命. 磨损是一种典型的材料退化过程，已有大量的模型用于磨损定量预测，其中以耗散磨损模型的物理基础较为严谨. 采用标准摩擦磨损试验机，以典型机械密封配副材料9Cr18Mo/M234A0为对象，以面接触、混合润滑为条件，在试验验证耗散磨损模型的基础上，建立以熵增量作为磨损等效量的磨损加速模型. 通过长时间-低熵率和短时间-高熵率的等效磨损试验对基于耗散磨损模型的加速退化试验进行验证，并与基于Archard模型的加速试验方法对比. 研究结果表明基于耗散磨损模型的加速退化试验可通过10 min量级的磨损试验等效实现200 min量级的磨损试验，试验误差为2.22%，其他模拟时间最大相对误差为4.75%. 试验结果初步验证该加速方法的可行性和准确性.

As the requirements for product reliability and service life continue to increase, the time and economic costs of product life measurement tests are also rising steadily. Therefore, accelerated life testing (ALT) and the subsequent accelerated degradation testing (ADT) have emerged, which use accelerated test data under high stress levels to estimate the reliability and service life of products under normal stress levels. Wear is a typical material degradation process, and a large number of models have been developed for quantitative wear prediction, among which the dissipative wear model has a relatively rigorous physical foundation. Using a standard friction and wear testing machine, taking the typical mechanical seal mating material 9Cr18Mo/M234A0 as the test object, and under the conditions of surface contact and mixed lubrication, a wear acceleration model with entropy increment as the wear equivalent quantity was established based on the experimental validation of the dissipative wear model. The accelerated degradation test based on the dissipative wear model was verified through equivalent wear tests of long-time low-entropy rate and short-time high-entropy rate, and compared with the accelerated test method based on the Archard model. The research results show that the accelerated degradation test based on the dissipative wear model can equivalently realize a 200-minute-level wear test through a 10-minute-level wear test, with a test error of 2.22%, and the maximum relative error of other simulation times is 4.75%. The test results preliminarily verify the feasibility and accuracy of this acceleration method.

搜集汇总

背景与挑战

背景概述

该数据集聚焦于基于耗散磨损模型的机械密封配副混合润滑磨损加速试验研究，旨在通过高应力水平的加速退化试验来预测正常条件下的磨损寿命。研究以典型材料9Cr18Mo/M234A0为对象，在混合润滑条件下建立以熵增量为等效磨损量的加速模型，验证了通过短时间试验（如10分钟）等效长时间试验（如200分钟）的可行性，误差控制在较低水平（最大相对误差4.75%），为降低寿命测试成本提供了有效方法。