Microstructure-Dependent Local Fatigue Cracking Resistance of Bimodal Ti-6Al-4V Alloys

2017 ◽  
Vol 20 (4) ◽  
pp. 1700702
Author(s):  
Ling-Rong Zeng ◽  
Li-Ming Lei ◽  
Jia Yang ◽  
Xue-Mei Luo ◽  
Guang-Ping Zhang
Keyword(s):  
Fatigue Cracking ◽  
Cracking Resistance

scholarly journals Fatigue Cracking Resistance of Engineered Cementitious Composites (ECC) under Working Condition of Orthotropic Steel Bridge Decks Pavement

2019 ◽  
Vol 9 (17) ◽  
pp. 3577 ◽  
Author(s):  
Yanjing Zhao ◽  
Jiwang Jiang ◽  
Fujian Ni ◽  
Lan Zhou
Keyword(s):  
Digital Image ◽  
Working Condition ◽  
Fatigue Cracking ◽  
Surface Strain ◽  
Internal Crack ◽  
Cementitious Composites ◽  
Cracking Resistance ◽  
Engineered Cementitious Composites ◽  
Crack Distribution ◽  
Scb Test

In order to investigate the fatigue cracking resistance of engineered cementitious composites (ECC) used in in total life pavement, the semi-circular bending (SCB) test and improved three-point bending fatigue test (ITBF) were utilized in this study. The digital image correlation (DIC) method was also utilized to track the surface strain fields of specimens during the SCB test. X-ray computed tomography (CT) and digital image processing (DIP) technologies were applied to measure the internal-crack distribution of the ITBF specimen. The results of the SCB test showed that the fatigue cracking damage process of ECC can be divided into three stages and that the cracking stable propagating stages occupied the main part, which indicates that ECC has excellent ductility and toughness and could work very well with existing cracks. The ITBF results showed that the fatigue cracking resistance of ECC was better than epoxy asphalt concrete (EAC). In addition, the internal-crack distribution along the depth direction of the ITBF specimen could be presented well by the image pixel statistical (IPS) method based on CT scanning of image slices. It could be found that multiple cracks propagate simultaneously in ECC, instead of a single crack, under the OSBD pavement working condition.

Fatigue Cracking Resistance of Fiber-Reinforced Asphalt Concrete

2005 ◽  
Vol 75 (2) ◽  
pp. 123-128 ◽  
Author(s):  
S. Joon Lee ◽  
Jon P. Rust ◽  
Hechmi Hamouda ◽  
Y. Richard Kim ◽  
Roy H. Borden
Keyword(s):  
Asphalt Concrete ◽  
Fatigue Cracking ◽  
Fiber Reinforced ◽  
Cracking Resistance

scholarly journals The Effect of Aging on the Cracking Resistance of Recycled Asphalt

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Mojtaba Mohammadafzali ◽  
Hesham Ali ◽  
James A. Musselman ◽  
Gregory A. Sholar ◽  
Aidin Massahi
Keyword(s):  
Asphalt Binder ◽  
Asphalt Mixture ◽  
Fatigue Cracking ◽  
Asphalt Mixtures ◽  
Asphalt Binders ◽  
Reclaimed Asphalt Pavement ◽  
Cracking Resistance ◽  
Recycled Asphalt ◽  
Reclaimed Asphalt ◽  
Important Concern

Fatigue cracking is an important concern when a high percentage of Reclaimed Asphalt Pavement (RAP) is used in an asphalt mixture. The aging of the asphalt binder reduces its ductility and makes the pavement more susceptible to cracking. Rejuvenators are often added to high-RAP mixtures to enhance their performance. The aging of a rejuvenated binder is different from virgin asphalt. Therefore, the effect of aging on a recycled asphalt mixture can be different from its effect on a new one. This study evaluated the cracking resistance of 100% recycled asphalt binders and mixtures and investigated the effect of aging on this performance parameter. The cracking resistance of the binder samples was tested by a Bending Beam Rheometer. An accelerated pavement weathering system was used to age the asphalt mixtures and their cracking resistance was evaluated by the Texas Overlay Test. The results from binder and mixture tests mutually indicated that rejuvenated asphalt has a significantly better cracking resistance than virgin asphalt. Rejuvenated mixtures generally aged more rapidly, and the rate of aging was different for different rejuvenators.

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