yutong, li mohammad fikry, m. j. koyanagi, jun
This study aims to explore the impact of load history on the premature failure of the viscoelastic polymer matrix in carbon-fiber-reinforced plastics (CFRPs) using a method based on the concept of fracture fatigue entropy (FFE). A user-defined subroutine (UMAT) developed by the authors in previous studies was incorporated to apply the FFE damage cr...
xiaofei, ma guo, ce wang, xiao
Introduction: The three-period minimal surface (TPMS) structure has great potential in the fields of lightweight and energy absorption due to its high strength, high porosity, and self-supporting characteristics [...]
nie, baohua liu, shuai yue, wu song, yu haiying, qi shi, binqing zhao, zihua chen, dongchu
Very high cycle fatigue (VHCF) tests were carried out under variable amplitude loading for TC21 titanium alloy. The first level of high amplitude loading was set as 950 MPa close to yield strength, and the second level of low amplitude loading was determined between 435 MPa and 500 MPa where fatigue cracks initiated at the specimen subsurface under...
al-karawi, hassan shams-hakimi, poja al-emrani, mohammad
High-frequency mechanical impact (HFMI) is a post-weld treatment method which substantially enhances the fatigue strength of steel weldments. As such, the method enables a more efficient design of bridges, where fatigue is often the governing limit state. Road bridges are typically trafficked by a large variety of lorries which generate load cycles...
De Waele, Wim Trogh, Sven De Tender, Steven Micone, Nahuel Hectors, Kris
This paper reports on an experimental study of fatigue crack growth in steel specimens. First, block loading tests (sequences of low and high stress intensity factor ranges ΔK) are discussed. Limited crack growth retardation occurs at transitions from low to high load ranges; significant retardation or crack arrest are observed in high-low transiti...
BENNEBACH, Mohamed PALIN-LUC, Thierry MESSAGER, Alexandre
The effect of a static and intermittent shear stress on the HCF strength of two quenched and tempered steel grades used to produce shafts in crane industry was studied on notched specimens (Kt=1.7 and 2.7) for being representative of critical areas. Three main load cases were considered: C1=rotative bending (RB), C2=RB and static torsion and C3=RB ...
Yunoh, M. F. M. Abdullah, S. Saad, M. H. M. Nopiah, Z. M. Nuawi, M. Z.
Abstract This paper focuses on analysis in determining the behaviour of variable amplitude strain signals based on extraction of segments. The constant Amplitude loading (CAL), that was used in the laboratory tests, was designed according to the variable amplitude loading (VAL) from Society of Automotive Engineers (SAE). The SAE strain signal was t...
BENNEBACH, Mohamed PALIN-LUC, Thierry MESSAGER, Alexandre
The effect of a static and intermittent shear stress on the HCF strength of two quenched and tempered steel grades used to produce shafts in crane industry was studied on notched specimens (Kt=1.7 and 2.7) for being representative of critical areas. Three main load cases were considered: C1=rotative bending (RB), C2=RB and static torsion and C3=RB ...
Muys, Louis Zhang, Jie Micone, Nahuel De Waele, Wim Hertelé, Stijn
In variable amplitude fatigue of high strength low alloy (HSLA) steel components, overloads can severely retard subsequent crack propagation for a number of cycles. In order to be able to predict fatigue crack propagation with a reduced degree of conservatism, retardation has to be taken into account. Of all numerical models that have been develope...
Nottebaere, Tom Micone, Nahuel De Waele, Wim
The loads imposed on e.g. offshore structures can vary considerably with time. Lifetime prediction methodologies need to consider possible acceleration and retardation of the crack growth rate due to load sequences. Models based on a linear accumulation of damage will have a limited accuracy and are not considered as a valuable asset in lifetime pr...
