in this research, the effect of 2.3 wt.% aluminum addition on the microstructure and tensile properties of high manganese austenitic steel fe-18mn-0.6c was studied. for this purpose, the samples were investment cast, homogenized and hot rolled. tensile testing was carried out at ambient temperature. microstructural investigations and fractography on the steel samples were carried out using an o...

The design of cement slurry for horizontal wellbores is challenging as it must present very high quality cement slurry properties e.g. zero free water, less than 50 cc API fluid loss value, appropriate rheology and yield point for effective displacement, adequate compressive strength, which is critical for lightweight slurries, and finally stable cement column behind casing. The main objective ...

This study experimentally investigates the effect of multi-walled carbon nanotubes (MWNT’s), as a reinforcing material, on the physical properties of heavy-weight oil well cements. A candidate well is selected and the properties of the cement slurry used in a problematic section of the well are tested in the laboratory. Carbon nanotubes (CNT’s) are added as fibers to the cement slurry and the i...

This paper presents a molecular level trade-off analysis on mechanophore embedded thermoset polymer matrix between its self-sensing capability and critical mechanical properties affecting performance. Dimeric 9-anthracene carboxylic acid (Di-AC), a mechanophore, was synthesized in epoxy polymer, and with the application of mechanical load, fluorescence was observed under ultraviolet (UV) excita...

The yield strength of moissanite was investigated at pressures up to 18.3 GPa and temperatures up to 1200 ∞C by analyzing the peak shapes of diffraction lines from a powder sample. At room temperature, the moissanite crystal behaves elastically with increasing pressure up to 13.7 GPa. At higher pressures applied, the sample is yielded; the yield strength of moissanite is determined to be 13.6 G...

The purpose of this study was to evaluate mechanical properties of the orthodontic wires according to heat treatment environments and cooling methods. Four types of wires were heat-treated in air, argon and vacuum at 500◦C, for 6 min, and were then either cooled in the furnace or a water bath. Increases in microhardness, maximal strength, yield strength and Young’s modulus of the orthodontic wi...

Instrumented contact experiments are performed on three metallic glasses to systematically study shear band formation near a stress concentration. The results suggest that high local stresses at a point in the glass are insufficient to initiate a shear band. Rather, the yield strength must be exceeded along the entire length of a viable shear path in order for a shear band to form. Because of t...

PO Box 513, 5600 MB Eindhoven, The Netherlands Introduction Osteoporotic fractures mainly occur at sites with relatively large amounts of trabecular bone. The devastating effects of such fractures can be prevented with accurate predictions of trabecular bone strength. Micro-finite element (μFE) models have been successfully used to study and predict trabecular bone elastic and yield properties....

For laser assisted Shape Deposition Manufacturing (SDM), residual stresses caused by the temperature gradient and material property mismatches result in part inaccuracy, warpage, or even delamination. The use of low coefficient of thermal expansion (CTE) materials such as Invar promises to reduce deformations caused by internal stresses [2]. Thus, to obtain high quality of prototypes for moldin...