2019
DOI: 10.1080/14680629.2019.1635516
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Predicting crack growth in viscoelastic bitumen under a rotational shear fatigue load

Abstract: This study develops a damage mechanics-based crack growth model to predict crack length in a typical viscoelastic material (i.e., bitumen) under a rotational shear fatigue load. This crack growth model was derived using torque and dissipated strain energy equilibrium principles. The crack length was predicted using bitumen's shear moduli and phase angles in the undamaged and damaged conditions, measured by linear amplitude sweep (LAS) tests and time sweep (TS) tests, respectively. The two tests were both perfo… Show more

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Cited by 40 publications
(39 citation statements)
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“…In a DSR fatigue test, the direct proof of the cracking damage is a circumferential edge crack, as illustrated in Figure 1. It initiates from the DSR sample circumferential edge and propagates toward the centre of the sample under the cyclic torsional loading, which were directly proved experimentally by the previous studies (Hintz and Bahia, 2013;Zhang and Gao, 2019). Thus, it is reasonable to define the healing index using the cracking length, since the healing is a process of crack reduction.…”
Section: Materials Parameters To Characterise Healing Of Bitumenmentioning
confidence: 80%
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“…In a DSR fatigue test, the direct proof of the cracking damage is a circumferential edge crack, as illustrated in Figure 1. It initiates from the DSR sample circumferential edge and propagates toward the centre of the sample under the cyclic torsional loading, which were directly proved experimentally by the previous studies (Hintz and Bahia, 2013;Zhang and Gao, 2019). Thus, it is reasonable to define the healing index using the cracking length, since the healing is a process of crack reduction.…”
Section: Materials Parameters To Characterise Healing Of Bitumenmentioning
confidence: 80%
“…To evaluate healing properties of the bitumen X70 under different damage levels, three strain levels (5%, 7% and 10%) shown in Figure 3 were adopted to produce different crack lengths when the healing rests all started at 20 min (i.e., the first time sweep test lasted for 20 min). 5% and 7% strain levels were previously utilised to predict the crack growth of bitumen sample in the time sweep test (Zhang and Gao, 2019), and the healing test designed in this paper was consist of two individual time sweep tests with a rest period separating them. Hence, strain levels of 5% and 7% were reselected to investigate the healing property of bitumen.…”
Section: Test Methods and Planmentioning
confidence: 99%
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