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In-situ experimental and numerical studies of the damage evolution and fracture in a Fe-TiB_2 composite

机译：Fe-TiB_2复合材料损伤演化与断裂的原位实验与数值研究

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摘要

A joint experimental and modelling study of plastic strain and ensuing damage in a novel metal matrix composite (Fe-TiB2) is presented. Damage is observed and quantified using SEM images processing and Acoustic Emission (AE) analysis. The use of AE confirms that the surface damage observed is strongly correlated to damage in the bulk of the material. The primary mode of damage is particle fracture. Very little particle decohesion is observed, indicating an exceptionally good cohesion of the steel/particle interface. Damage is initiated soon after the composite yield point is reached and increases significantly with strain. Macroscopic failure of the tensile specimen occurs when about 25% of the particles are fractured. This corresponds to about 21% engineering strain.Using in-situ SEM tensile tests with quantitative digital image correlation (DIC), full-field strain measurements are obtained and particle fracture quantified. The results of fields measurements are compared to results of a FFT based homogenization method with boundary conditions retrieved from the experiment. A good agreement is found between the DIC-measured and FFT-predicted results. Estimated values of the particle fracture stress are obtained.
机译：提出了一种新型金属基复合材料（Fe-TiB2）的塑性应变及其后续损伤的联合实验和模型研究。使用SEM图像处理和声发射（AE）分析观察并量化损伤。 AE的使用证实了所观察到的表面损伤与大部分材料的损伤密切相关。破坏的主要方式是颗粒破裂。观察到非常小的颗粒内聚力，表明钢/颗粒界面的内聚力非常好。达到复合材料屈服点后立即开始破坏，并随应变显着增加。当约25％的颗粒破裂时，会发生拉伸试样的宏观破坏。这相当于约21％的工程应变。使用具有定量数字图像相关性（DIC）的原位SEM拉伸测试，可以获得全场应变测量结果并量化了颗粒破裂。将场测量结果与基于FFT均质化方法的结果进行比较，并从实验中检索出边界条件。在DIC测量结果和FFT预测结果之间找到了很好的一致性。获得颗粒断裂应力的估计值。

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