WeeLiam has a Ph.D. funded by TWI and Brunel University. His Ph.D. research focus primarily on Fracture Mechanics of structural steel in the oil and gas industry. Due to the nature of his research, the findings from his research contributed to the improvement of fracture toughness standards ISO 12135 and ISO 15653. He is currently a member of the BSI toughness testing committee.
Currently, WeeLiam's been working on:
- the assessment of fracture toughness of metal matrix composites.
- fracture, fatigue, corrosion and integrity assessment of cast iron structures.
Areas of specialism
Study of Crack Tip Opening Displacement (CTOD) in Single Edge Notched Bend (SENB) specimens.
Affiliations and memberships
- Fracture mechanics
- Mechanical testing
- Fracture toughness testing
For CTOD R-curves, the methods based on CTOD from J in ISO 12135 and ASTM E1820 gave lower and less accurate R-curves than the rigid rotation methods in BS 7448-4 and WES 1108. However, the accuracy of the BS 7448-4 formula varied for the different strain hardening materials, and overestimated the R-curves in the low tensile ratio stainless steel.
Investigations into the effect of the assumption about rigid rotation in different strain hardening materials led to a rotational factor function of tensile ratio, rp sh, to be developed from numerical modelling. When this function was substituted into standard equations in place of the fixed value of rp an improvement in the accuracy of BS 7448-4 R-curves compared to replica measurements was seen for the range of strain hardening investigated, but it did not significantly improve the accuracy of the WES 1108 formula, which accounts for strain hardening in other parameters.
A combination of the elastic CTOD part of the WES 1108 formula, with the plastic CTOD incorporating the modified rotational factor, was concluded to offer the optimum method to determine CTOD R-curves for a range of strain hardening materials.
Khor W, Moore PL, Pisarski HG, Brown CJ (2018) A modified approach to the rigid rotation plastic hinge point in SENB specimens in different strain hardening alloys and crack depth. In: BSI, ed. ISE/101/04 Toughness testing annual meeting.
Khor W, Moore PL, Pisarski HG, Brown CJ (2018) Determination of the rigid rotation plastic hinge point in SENB specimens in different strain hardening steels. In: Physics Io, ed. Modern Practice in Stress and Vibration Analysis. Institute of Physics, Clare College, Cambridge, UK.
Khor W (2018) Crack tip opening displacement (CTOD) in single edge notched bend (SEN(B)). Dept of Mechanical Aerospace and Civil Engineering Brunel University London, Brunel University London, http://bura.brunel.ac.uk/handle/2438/16198
Khor, W. (2016) Measurement and prediction of CTOD in austenitic stainless steel. In National Structural Integrity Research Centre Conference 2016. Cambridge.
Khor, W. (2015) Validation of Standardized CTOD Equations. In National Structural Integrity Research Centre Conference 2015. Cambridge.
Khor, W. & Pisarski, H. (2015) Comparison of CTOD estimation procedures with physical measurements. In International Institute of Welding Annual Assembly.