scholarly journals The effect of loading rate on fracture energy of asphalt mixture at intermediate temperatures and under different loading modes

2017 ◽  
Vol 12 (43) ◽  
pp. 113-132 ◽  
Author(s):  
M.R.M. Aliha ◽  
M. Fakhri ◽  
E. Haghighat Kharrazi ◽  
F. Berto
Keyword(s):  
Fracture Energy ◽  
Loading Rate ◽  
Asphalt Mixture ◽  
Loading Modes

Development of a multi-modal overlay tester for the evaluation of asphalt overlay cracking behaviors

2020 ◽  
Vol 47 (11) ◽  
pp. 1258-1266 ◽  
Author(s):  
Christopher Jabonero ◽  
Jin-Whoy Park ◽  
SungWoo Ryu ◽  
Wuguang Lin ◽  
Yoon-ho Cho
Keyword(s):  
Lateral Displacement ◽  
Asphalt Mixture ◽  
Single Mode ◽  
Critical Issue ◽  
Mode I ◽  
Traffic Loading ◽  
Reflection Cracking ◽  
Asphalt Overlay ◽  
Loading Modes ◽  
Overlay Tester

Reflection cracking is a critical issue in asphalt overlay pavement. Temperature variation and traffic loading are the main fracture modes acting on the material. In this paper, a multi-modal overlay tester is proposed for the evaluation of the reflection cracking resistance of an asphalt mixture, an approach that simulates three loading modes on asphalt specimens. A fine dense-grade hot mix asphalt is used as the test specimen and subjected to different loading conditions such as single Mode I, II, and III loading simulations and combined I+II and I+II+III loading simulations. Results show coefficients of variation (CVs) of 2.5%, 10.3%, and 7.4% for the Mode I, II, and III loading simulations, respectively. Furthermore, the β coefficient, with a CV of 7%, is used to represent the crack resistance of the asphalt mixture. Finally, the crack propagation occurs rapidly when subjected to tension and lateral displacement prior to repeated traffic loading simulations.

FRACTURE BEHAVIOR OF Zr-BASED BULK METALLIC GLASS UNDER IMPACT LOADING

2006 ◽  
Vol 20 (25n27) ◽  
pp. 4359-4364 ◽  
Author(s):  
HYUNG-SEOP SHIN ◽  
KI-HYUN KIM ◽  
SANG-YEOB OH
Keyword(s):  
Fracture Toughness ◽  
Crack Initiation ◽  
Fracture Energy ◽  
Impact Loading ◽  
Static Loading ◽  
Fracture Behavior ◽  
Loading Rate ◽  
Shear Bands ◽  
Maximum Load ◽  
Cu Alloy

The fracture behavior of a Zr -based bulk amorphous metal under impact loading using subsize V-shaped Charpy specimens was investigated. Influences of loading rate on the fracture behavior of amorphous Zr - Al - Ni - Cu alloy were examined. As a result, the maximum load and absorbed fracture energy under impact loading were lower than those under quasi-static loading. A large part of the absorbed fracture energy in the Zr -based BMG was consumed in the process for crack initiation and not for crack propagation. In addition, fractographic characteristics of BMGs, especially the initiation and development of shear bands at the notch tip were investigated. Fractured surfaces under impact loading are smoother than those under quasi-static loading. The absorbed fracture energy appeared differently depending on the appearance of the shear bands developed. It can be found that the fracture energy and fracture toughness of Zr -based BMG are closely related with the extent of shear bands developed during fracture.

scholarly journals Unified Strength Model of Asphalt Mixture under Various Loading Modes

Materials ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 889 ◽  
Author(s):  
Chengdong Xia ◽  
Songtao Lv ◽  
Lingyun You ◽  
Dong Chen ◽  
Yipeng Li ◽  
...  
Keyword(s):  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Structure Design ◽  
Strength Model ◽  
Compression Tests ◽  
Unconfined Compression ◽  
Direct Tension ◽  
Indirect Tension ◽  
Pavement Structure ◽  
Loading Modes

Although the rutting resistance, fatigue cracking, and the resistance to water and frost are important for the asphalt pavement, the strength of asphalt mixture is also an important factor for the asphalt mixture design. The strength of asphalt mixture is directly associated with the overall performance of asphalt mixture. As a top layer material of asphalt pavement, the strength of asphalt mixture plays an indispensable role in the top structural bearing layer. In the present design system, the strength of asphalt pavement is usually achieved via the laboratory tests. The stress states are usually different for the different laboratory approaches. Even at the same stress level, the laboratory strengths of asphalt mixture obtained are significantly different, which leads to misunderstanding of the asphalt mixtures used in asphalt pavement structure design. The arbitrariness of strength determinations affects the effectiveness of the asphalt pavement structure design in civil engineering. Therefore, in order to overcome the design deviation caused by the randomness of the laboratory strength of asphalt mixtures, in this study, the direct tension, indirect tension, and unconfined compression tests were implemented on the specimens under different loading rates. The strength model of asphalt mixture under different loading modes was established. The relationship between the strength ratio and loading rate of direct tension, indirect tension, and unconfined compression tests was adopted separately. Then, one unified strength model of asphalt mixture with different loading modes was established. The preliminary results show that the proposed unified strength model could be applied to improve the accurate degree of laboratory strength. The effectiveness of laboratory-based asphalt pavement structure design can therefore be promoted.

scholarly journals Fracture Performance of a Large-Stone Asphalt Mixture Based on a Monotonic Tensile Overlay Test

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Jianhui Wei ◽  
Tao Fu ◽  
Junlin Liang
Keyword(s):  
Constitutive Model ◽  
Fracture Energy ◽  
Asphalt Mixture ◽  
Test Results ◽  
Large Stone ◽  
Loading Mode ◽  
Disturbed State Concept ◽  
Study Results ◽  
Fracture Performance ◽  
Base Course

A large-stone asphalt mixture (LSAM) is usually used as the base course of asphalt pavement to prevent the generation of cracks. However, there are few studies on the fracture performance and crack resistance of LSAMs. Under the monotonic tensile loading mode, the overlay test (OT) was explored to investigate the influence of different test factors on the cracking resistance and fracture performance. The study results indicated that a change in temperature and aging results in a variation in fractal dimension, the fracture energy of crack growth is higher than that of crack initiation, and fracture energy is increased to a certain extent by decreased temperature, an increased loading rate or increased aging. Finally, a constitutive model is established based on the disturbed state concept (DSC), and the proposed constitutive model is consistent with the test results.

scholarly journals Correction: Xia, C.; et al. Unified Strength Model of Asphalt Mixture under Various Loading Modes. Materials 2019, 12, 889

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5393
Author(s):  
Chengdong Xia ◽  
Songtao Lv ◽  
Lingyun You ◽  
Dong Chen ◽  
Yipeng Li ◽  
...  
Keyword(s):  
Asphalt Mixture ◽  
Strength Model ◽  
Loading Modes

The authors wish to make the following correction to this paper [...]

scholarly journals Interfacial Fracture in Fibre-Metal Laminates Based on Glass Fibre Reinforced Polypropylene

1998 ◽  
Vol 7 (4) ◽  
pp. 096369359800700 ◽  
Author(s):  
G. Reyes ◽  
W.J. Cantwell
Keyword(s):  
Maleic Anhydride ◽  
Fracture Energy ◽  
Glass Fibre ◽  
Loading Rate ◽  
Interfacial Fracture ◽  
Fracture Properties ◽  
Glass Fibre Reinforced ◽  
Fibre Metal ◽  
Fibre Metal Laminate ◽  
Excellent Adhesion

This papers examines the interfacial fracture properties of a new fibre-metal laminate based on glass fibre reinforced polypropylene (GFPP). Tests have shown that excellent adhesion between aluminium and GFPP can be achieved by incorporating a maleic-anhydride modified polypropylene interlayer between the composite and aluminium layers. Single cantilever beam tests have shown that the fracture energy of these systems initially increases with loading rate and then decreasing. In spite of this, the fracture energy is extremely high at all rates.

Effect of loading rate on cohesive parameters of the adhesive Araldite 2015

2020 ◽  
Vol 62 (9) ◽  
pp. 943-950
Author(s):  
Engin Erbayrak ◽  
Halil Ozer
Keyword(s):  
Fracture Toughness ◽  
Plastic Deformation ◽  
Fracture Energy ◽  
Transition Region ◽  
Cantilever Beam ◽  
Epoxy Matrix ◽  
Loading Rate ◽  
Double Cantilever Beam ◽  
Loading Rates ◽  
Softening Behavior

Abstract This study addresses the effect of loading rates on cohesive parameters and microstructural composition of the Araldite 2015 adhesive. Double Cantilever Beam (DCB) samples were tested under the loading rates of 1, 5, 10, 20, 100 and 200 mm × min-1. The Park-Paulinho-Roeser model (PPR model) was used to get cohesive parameters. In modelling of the softening behavior, inverse analyses were performed using the date obtained from the PPR softening curves. It was seen that the fracture energy and cohesive parameters are decreasing with increasing the loading rate. However, there seems to be a transition region where the fracture energy nearly remains constant. Microstructural analyses were implemented in order to study the effects of the loading rates on the characteristics of the fracture surfaces. It was concluded that the loading rates greatly influence the distribution of micro-voids in the epoxy matrix. Moreover, the presence of voids in epoxy matrix improved the plastic deformation around the crack tip and increased the fracture toughness.

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