Abstract One of the most prevalent challenges faced in road construction is pavement distresses produced by ageing asphalt pavement, which resulted fatigue cracking. Fatigue cracking regarded as one primary failure types when tension bituminous layer low due to high vehicle traffic load repetition. The study focuses on evaluating performance coconut fiber modifier bitumen penetration grade 60/7...

Distortion-induced fatigue cracking in unstiffened web gaps is common in steel bridges. Previous research by the Minnesota Department of Transportation (Mn/DOT) developed methods to predict the peak web gap stress and maximum differential deflection based upon field data and finite element analyses from two skew supported steel bridges with staggered bent-plate and cross-brace diaphragms, respe...

A progress report of the ret arch invest carried out on the problem of stress-cor high strength materials under ARPA Order Work at Carnegie-Mellon University, Lehi Georgia Institute of Technology, The Boe American University, and the Naval Resea cerning test techniques, materials chara metallurgy, surface studies, and corrosi described. The report is divided into t covering work on high strengt...

Reliable and durable asphalt surfacing systems still remain to be desired for the long-spanned orthotropic steel bridges as the nationally and internationally reports on distresses in deck pavement. Based on ten-year research works, this paper has presented a brief review and discussion of the Chinese practices and experiences of deck pavement on long-spanned steel bridges, including issues of ...

This work aims to improve the rutting and fatigue cracking resistance of asphalt binders using selected nanoor micro-sized materials and to shed light on the microstructure changes induced by such modification to asphalt binders. The four modifiers (Nanomer I.44P, carbon microfiber, non-modified nanoclay and polymer modified nanoclay) were added into the control asphalt binder (PG 58-34). The S...

Abstract Combinations of temperature, stress and hot corrosion may cause environmentally-assisted cracking in precipitation-hardened Ni-base superalloys, which is little understood. This research aims to increase current understanding by investigating the effects mechanical on propagation rate during corrosion-fatigue testing CMSX-4, CM247LC DS IN6203DS. The parameters used tests included a hig...

NASA has conducted an Airframe Structural Integrity Program to develop the methodology to predict the onset of widespread fatigue damage in lap-splice joints of fuselage structures. Several stress analysis codes have been developed or enhanced to analyze the lap-splice-joint configuration. Fatigue lives in lap-splicejoint specimens and fatigue-crack growth in a structural fatigue test article a...

A study has been made to discern the mechanisms for the delayed failure of 2-μm thick structural films of n+-type, polycrystalline silicon under high-cycle fatigue loading conditions. Such polycrystalline silicon films are used in smallscale structural applications including microelectromechanical systems (MEMS) and are known to display ‘metal-like’ stress-life (S/N) fatigue behavior in room te...

Fatigue crack initiation and early short crack propagation behaviour in two microstructural variants of a recently developed Low Solvus, High Refractory (LSHR) disc superalloy at room temperature has been investigated by three-point bending with replication procedure. The results shows that fine gained (FG) LSHR possesses higher fatigue life due to its better crack initiation resistance, limite...

Using crystal plasticity, finite element analyses were carried out to model cyclic deformation for a low solvus high refractory (LSHR) nickel superalloy at elevated temperature. The analyses were implemented using a representative volume element (RVE), consisting of realistic microstructure obtained from SEM images of the material. Monotonic, stress-relaxation and cyclic test data at 725 C were...