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首页> 外文会议>Mechanical properties and performance of engineering ceramics and composites VII >FRETTING FATIGUE FAILURE OF ENGINEERING CERAMICS
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FRETTING FATIGUE FAILURE OF ENGINEERING CERAMICS

机译：工程陶瓷的疲劳疲劳破坏

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摘要

Rollers made of engineering ceramic are very well suitable for hot rolling of high-strength steels. During the shaping process the ceramic rollers are highly loaded. The appearing complex loading is caused by a cyclic loading from the rotation of the rollers and high Hertzian stresses connected with friction, caused by the contact between the rollers and the rolling stock during the shaping process. To investigate the lifetime behavior of potential roller materials, fretting fatigue tests are carried out in a modified four-point-bending unit, where a fretting pad is pressed onto the tensile loaded side of the bending bar and oscillated. In the test series, carried out on silicon-nitride and alumina, different types of the fretting loading were realized. In all test series the ceramics are damaged by the fretting loading by the initiation and/or activation of cracks. In static tests a fretting fatigue loading leads to lower residual strengths. The strong tensile field in the specimen caused by the oscillating fretting pad leads to an activation of the surface defects, but doesn't influence the R-curves of the materials. In cyclic tests the additional cyclic four-point-bending-loading causes a strong degradation of the reinforcement elements, which leads to a more lower R-curve than expected from the pure four point bending and the lifetime gets significant lower. The variation of the fretting loading helps to separate and understand the damage mechanisms.
机译：工程陶瓷制成的辊子非常适合高强度钢的热轧。在成型过程中，陶瓷辊会承受很高的负荷。出现的复杂载荷是由于辊子的旋转产生的周期性载荷以及在成型过程中辊子与机车车辆之间的接触所引起的，与摩擦有关的高赫兹应力引起的。为了研究潜在辊子材料的使用寿命，在改进的四点弯曲单元中进行了微动疲劳试验，在该单元中，微动垫被压在弯曲杆的受拉载荷侧并发生振荡。在对氮化硅和氧化铝进行的测试系列中，实现了不同类型的微动载荷。在所有测试系列中，由于裂纹的产生和/或激活，微动载荷都会损坏陶瓷。在静态测试中，微动疲劳载荷导致较低的残余强度。摆动的微动垫在样品中产生的强拉伸场会导致表面缺陷的活化，但不会影响材料的R曲线。在循环测试中，附加的循环四点弯曲载荷会导致增强元件的强烈降解，从而导致R曲线比纯四点弯曲所预期的要低得多，并且使用寿命会大大降低。微动载荷的变化有助于分离和了解损伤机理。

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