We compared nanoindentation and nanoscratch testing of 10 and 50 nm thick tetrahedral amorphous carbon (ta-C) and hydrogenated amorphous carbon (a-C:H). Raman spectroscopy shows the expected spectral features for the two carbon forms, however, luminescence from the ceramic substrate can alter the spectra. We find that hard ta-C films can blunt the diamond tip and hence use a tip area function r...

Torsional fretting behavior of TC4 titanium alloy has been investigated at different parameters to explore the wear resistance and mechanisms alloy. The loops, dissipated friction energy torque under normal load (100N 200N), angular displacement (±0.5° ±2°) frequency (10Hz 15Hz) were studied reveal mechanical during fretting. Results showed that made difference in while was most important facto...

Due to its unique single-phase multivariate alloy characteristics and good low-temperature mechanical properties, CoCrFeNiMn high entropy (HEA) has attracted the interest of many researchers in recent years. In this paper, improve wear resistance Q235 steel surface, CoCrFeNiMnSnx HEA coatings were prepared on surface via laser cladding. X-ray diffractometry, optical microscopy, scanning electro...

Glass fiber reinforced polymer (GFRP) is a typical difficult-to-process material. Its drilling quality directly affected by the processing technology and tool life; burrs, tearing, delamination other defects will reduce service life of GFRP structural parts. Through damage wear experiments GFRP, thrust force, vibration amplitude, number processed holes, feed rate cutting speed were found to be ...

Fiber Reinforced Polymer (FRP) laminates have been widely used in engineering applications recent decades. This is mainly due to their superior mechanical properties compared single-phase materials. High strength-to-weight ratio, high stiffness, and excellent corrosion fatigue resistance are some of the attractive these In large structures, drilling composite panels a typical operation assemble...

Blistering, delamination, substrate deterioration Blistering, delamination, corrosion Blistering, reduced cohesion, film splitting, delamination Blistering, reduced cohesion, delamination, corrosion Blistering, intercoat delamination From components of paint film (e.g., inhibitive pigments, solvents, additives, etc.) From components of lower paint films (e.g., inhibitive pigments, solvents, add...

Channeling cracks in brittle thin films have been observed to be a key reliability issue for advanced interconnects and other integrated structures. Most theoretical studies to date have assumed no delamination at the interface, while experiments have observed channel cracks both with and without interfacial delamination. This paper analyzes the effect of interfacial delamination on the fractur...

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...

In this paper, the tool wear mechanisms for low-frequency vibration-assisted drilling (LF-VAD) of carbon fiber-reinforced polymer (CFRP)/Ti6Al4V stacks are investigated at various machining parameters. Based on kinematics analysis, effect vibration amplitude chip formation, uncut thickness, radian, and axial velocity examined. Subsequently, LF-VAD cutting temperature, wear, delamination, geomet...