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Keywords: hardness
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Journal Articles
Article Type: Bridging Microstructure, Properties, And Processing Of Polymer-Based Advanced Materials
J. Eng. Mater. Technol. January 2012, 134(1): 010907.
Published Online: December 14, 2011
...) and pole figure analysis. The mechanical properties (modulus, hardness, and strain rate sensitivity parameter) of the epoxy system annealed in the magnetic field were probed with the aid of instrumented nanoindentation, and the results are compared to the reference epoxy sample. To further examine...
Journal Articles
Article Type: Research Papers
J. Eng. Mater. Technol. April 2011, 133(2): 021018.
Published Online: March 22, 2011
.... Fatigue life was normally increased of four to five times, although improvements up to an order of magnitude were detected. Hardness measurements, profilometry, scanning electron microscopy, and X-ray diffractometry allowed interpreting the improvement of the fatigue behavior of the peened substrates...
Journal Articles
Article Type: Research Papers
J. Eng. Mater. Technol. July 2010, 132(3): 031003.
Published Online: June 15, 2010
... the morphology, microstructure, hardness, scratch resistance, and adhesion strength of the Al 2 O 3 films were progressively imprinted. The FB process led to the deposition of a good-looking and well-adhered graded Al 2 O 3 coating, which was found to be progressively richer in Al 2 O 3 on moving from...
Journal Articles
Article Type: Predictive Science And Technology In Mechanics And Materials
J. Eng. Mater. Technol. October 2009, 131(4): 041203.
Published Online: August 27, 2009
... membrane, on the order of 400–500 MPa, is approximately one-half of the flow stress inferred from nanoindentation hardness results between 1.9 GPa and 3.4 GPa, and is a result of microscale yielding prior to uniform deformation in these high strength systems. 24 01 2009 18 03 2009 27 08...
Journal Articles
Article Type: Research Papers
J. Eng. Mater. Technol. January 2009, 131(1): 011002.
Published Online: December 15, 2008
... to dislocation densities is used in a specialized finite-element modeling framework. The asperity model and the loading conditions are based on realistic service conditions consistent with rf MEMS with metallic normal contacts. The evolving microstructure, stress fields, contact width, hardness, residual effects...
Journal Articles
Article Type: Research Papers
J. Eng. Mater. Technol. October 2008, 130(4): 041010.
Published Online: September 19, 2008
... region, also in the bulk matrix, and on the glass fiber. The variation in mechanical properties such as modulus, stiffness, hardness, and penetration depth were obtained within the interphase by indenting at the fiber surface outward. Variations of the elastic modulus in the interphase region and its...
Journal Articles
Article Type: Research Papers
J. Eng. Mater. Technol. October 2008, 130(4): 041004.
Published Online: September 9, 2008
... the weld centerline than in the location of the minimum hardness. 03 04 2007 17 10 2007 09 09 2008 butt welding fracture hardness laser beam welding mechanical testing rolling steel diode laser Nd:YAG laser formability DP980 steel softened HAZ Currently, many...
Journal Articles
Article Type: Research Papers
J. Eng. Mater. Technol. July 2008, 130(3): 031007.
Published Online: June 10, 2008
... and hardness measurements and was correlated to the microstructures of the weld and base material. Stir zones (SZs) in the 5083 specimens were much softer than the strain-hardened base materials. SZs in the 6111 material are approximately as hard as the base material. Natural aging of 6111 FSW specimens...
Journal Articles
Article Type: Technical Papers
J. Eng. Mater. Technol. October 2007, 129(4): 609–613.
Published Online: July 2, 2007
... at a constant cavitation number with various nozzle-traveling velocities. Residual stress induced by oil jet cavitation peening was measured using X-ray diffraction. Oil cavitation jet peening results in a smooth and hard surface. The developed compressive residual stresses at the peened surface are about 52...
Journal Articles
Article Type: Technical Papers
J. Eng. Mater. Technol. October 2007, 129(4): 505–512.
Published Online: April 9, 2007
...Amin H. Almasri; George Z. Voyiadjis Traditionally, the hardness of materials is determined from indentation tests at low loading rates (static). However, considerably less work has been conducted in studying the dynamic hardness of materials using relatively high loading rates. In the present work...
Journal Articles
Article Type: Technical Papers
J. Eng. Mater. Technol. July 2007, 129(3): 462–467.
Published Online: January 11, 2007
... increases in hardness, 0.2% yield strength and ultimate tensile strength, but a significant increase in ductility and work of fracture of magnesium. The fracture mode was changed from brittle for pure Mg to mix ductile and intergranular in the case of nanocomposites. 03 07 2006 11 01 2007...
Journal Articles
Article Type: Technical Papers
J. Eng. Mater. Technol. October 2007, 129(4): 523–529.
Published Online: December 13, 2006
... microscopy X-ray diffraction indentation Stellite alloy heat treatment molybdenum carbides Co solid solution mechanical properties hardness wear Stellite ® alloys are cobalt-based materials typically comprised of chromium-rich carbides, M 7 C 3 and/or M...
Journal Articles
Article Type: Technical Papers
J. Eng. Mater. Technol. April 2007, 129(2): 233–241.
Published Online: July 31, 2006
... was also conducted. It was found that hydroforming in the W temper facilitates forming of a bigger T branch (due to available greater ductility), but limits the strength (hardness) of the final component compared to that formed in the T4 condition. By optimizing the material heat-treatment conditions...
Journal Articles
Article Type: Technical Papers
J. Eng. Mater. Technol. April 2007, 129(2): 194–199.
Published Online: June 17, 2006
... of coefficient of thermal expansion of the reinforced magnesium shows dimensionally more stable magnesium as compared to monolithic magnesium. The hardness 0.2% YS and UTS were found to improve significantly after addition of nanosized SiC and nanosized hybrid Si C + Al 2 O 3 particles to the magnesium, However...
Journal Articles
Article Type: Technical Papers
J. Eng. Mater. Technol. January 2007, 129(1): 105–112.
Published Online: June 13, 2006
... polypropylene structures were then subjected to quasi-static tensile, flexural, hardness and impact tests. Analysis of test data show that the mechanical properties increase with an increase in nanoclay loading up to a threshold of 2 wt. % ; thereafter, the material properties degrade. At low weight nanoclay...
Journal Articles
Article Type: Design Innovations
J. Eng. Mater. Technol. July 2006, 128(3): 468–475.
Published Online: March 5, 2006
... of the induced stress, the scanning electron microscopy, transmission electron microscopy, and nanoindentation techniques are used to examine the microstructure and hardness of the white layer resolidified on the EDMed surface. The experimental results reveal that combination of the hole-drilling strain-gage...
Journal Articles
Article Type: Research Papers
J. Eng. Mater. Technol. July 2006, 128(3): 445–450.
Published Online: February 27, 2006
... functionally graded material (FGM) was investigated that combines superelastic and shape memory capabilities of NiTi with the high hardness, wear, and corrosion resistance of Ti C x . CS was employed to produce a FGM from 100% Ti C x ceramic to 100% NiTi intermetallic. Temperature and burning velocity data...
Journal Articles
Article Type: Research Papers
J. Eng. Mater. Technol. April 2006, 128(2): 225–233.
Published Online: June 21, 2005
... response of the films during indentation or the force-deflection response of micromachined beams in bending. The films showed increasing hardness/modulus with a decrease in pore volume fraction or transformation from amorphous to a polycrystalline alpha-alumina phase. The asymmetric films show higher...
Journal Articles
Article Type: Special Section On Nanomaterials And Nanomechanics
J. Eng. Mater. Technol. October 2005, 127(4): 451–456.
Published Online: February 22, 2005
... the control films exhibits a crystallographic texture. Nanoindentation experiments show that the hardness of the nanocomposite thin film is approximately 25% higher than the hardness of the control films of pure copper. A prototype of a microchannel array in the nanocomposite thin film was made using standard...
Journal Articles
Article Type: Research Papers
J. Eng. Mater. Technol. January 2005, 127(1): 154–158.
Published Online: February 22, 2005
...Sung-Hoon Kim; Eun-chae Jeon; Dongil Kwon Hardness tests are performed to determine not only hardness but also other properties such as strength, wear resistance, and deformation resistance. They are also performed to predict residual lifetime through analysis of the hardness reduction or hardness...