论文标题
在加上金属中建模由于孔隙度而导致的强度和故障变异性
Modeling strength and failure variability due to porosity in additively manufactured metals
论文作者
论文摘要
为了建模和量化由于其微观结构缺陷而导致的可塑性金属可塑性和失效的变异性，我们基于伪边缘可能性和嵌入式变异性技术开发了不确定性定量方法。我们既说明了初始材料的计算机断层扫描扫描的孔隙率，也可以通过以身体动机的模型来解析空隙的阈值分布。该模型的校准表明缺陷的亚阈值种群主导了产量和失败响应。该技术还使我们能够量化与制造过程创建的微结构可变性相关的材料参数的分布，从而评估材料质量和过程控制。
To model and quantify the variability in plasticity and failure of additively manufactured metals due to imperfections in their microstructure, we have developed uncertainty quantification methodology based on pseudo marginal likelihood and embedded variability techniques. We account for both the porosity resolvable in computed tomography scans of the initial material and the sub-threshold distribution of voids through a physically motivated model. Calibration of the model indicates that the sub-threshold population of defects dominates the yield and failure response. The technique also allows us to quantify the distribution of material parameters connected to microstructural variability created by the manufacturing process, and, thereby, make assessments of material quality and process control.
