Stress Rupture and Creep 测试

Creep testing is critical to understanding and preventing product failures. im体育APP performs both stress rupture and creep testing for metals, 复合材料, and plastics to determine the long-term stress on materials.

Stress rupture and creep testing are specialized 机械测试 methods that provide manufacturers with critical data about their product's performance over time. 在测试过程中, a material is held under a definite constant temperature for a given period of time, 高达1200°C(2192°F), 直到失败发生. Our experts then analyze the results to provide essential data about physical and thermal stress over extended periods.

蠕变测试是如何进行的?

Creep testing is performed using a tensile specimen with a special design extensometer, 施加恒应力, 和温度. The test is performed in furnaces or environmental chambers and recorded on a graph of strain versus time to show the creep rate

At a certain temperature and stress, materials begin to "creep," meaning they permanently deform. This can be observed in metals and alloys, ceramics, plastics, and even wood and stone. 在金属, this process begins at about one-third of the melting temperature and increases at higher temperatures. Creep is caused by diffusion processes and dislocation movements in the material.

Creep is the time-dependent deformation of a material while under an applied load below its yield 强度. It is most common at elevated temperatures, but some materials will exhibit creep at room temperature. Unless stopped, testing terminates in creep rupture.

What are the three stages of creep?

蠕变发生在三个阶段:

• 初级蠕变(第一阶段) -测试开始. 蠕变曲线呈上升趋势, and the creep rate is high at the start of the test, 随时间缓慢递减.
• 二次蠕变(阶段II) – This is the stable part of the curve, where the creep rate is low and stable.
• 三级蠕变(第三阶段) -这是最后的蠕变阶段, the creep rate is rising at the same rate as elongation, and there is a reduction of the sample area. This will soon result in a rupture of the specimen.

什么是应力破裂?

Stress rupture is the sudden and complete failure of a material under stress. 在测试过程中, the sample is held at a specific load level 和温度 for a pre-determined amount of time. In stress rupture testing, loads may be applied by 拉伸弯曲, 弯曲, biaxial, or hydrostatic methods.

Our stress rupture and creep test services

With accreditations including ISO and Nadcap, im体育APP is committed to providing the highest quality stress rupture and creep testing services to clients across many sectors. Our stress rupture testing and creep testing laboratories are continuously growing to meet the needs created by new and advanced materials. 

im体育APP优势

im体育APP laboratories are also fully supported by experienced in-house machine shops that provide precise specimen preparation and fixture fabrication on all specimen and material types.

For more information about our stress rupture and creep test methods or to request a quote, 今天就联系专家.