Session: MF-17-02 Advanced and Additive Manufacturing and Material Technologies (joint with D&A)

Paper Number: 85651

85651 - Fracture Toughness Testing of 316L Steel Manufactured by Laser Powder Bed Fusion 

Laser Powder Bed Fusion (LPBF is a relatively new manufacturing technique that offers many benefits. However the utilisation of SLM manufactured components depends on the assurance of their integrity during operation. Samples manufactured through) are prone to defects. Therefore,  it is important to determined the fracture toughness of the materials.  In this work, fracture toughness test on single edge notched bend (SENB) samples have been performed and the results are prsented. The samples have been manufactured in 3 orthogonal directions enabling the influence of defect orientation on toughness to be determined. The crack tip strain fields have been imaged using digital image correlation techniques and compared to that predicted using 2D finite element analysis (FEA). Finite element models have also been developed the predict the fracture toughness of the SENB samples, using the ductility exhaustion approach and employing the Rice and Tracey model for the influence of stress triaxiality on fracture toughness. The FEA results are compared to the experimental results and a sensitivity study is performed to understand the role of uncertainty in the material’s ductility to fracture toughness predictions. Generally, it has been found that the toughness of samples with the crack plane parallel to the build layers (vertical) is much less than that of samples with the crack plane normal to the build layers (horizontal). 

Presenting Author: Fabian Sorce Imperial college london

Presenting Author Biography: Post doc in Mech eng imperial college

Authors:

Ee Tan imperial college london
Fabian Sorce Imperial college london
Catrin Mair Davies Imperial College London