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Effects of delamination in drilling glass/polyester composite

Mehdi GANJIANI, Majid SAFARABADI, Nabi MEHRI-KHANSARI, Hossein ORUJI

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 2, Pages 552-567 doi: 10.1007/s11709-021-0699-7

Abstract: In addition, the interlaminar mixed-mode (I/II) loadings were determined using an ARCAN test fixturestrain energy release rate (CSERR) was then obtained using an experimental test performed using an ARCAN

Keywords： delamination VCCT ARCAN specimen drilling mode II

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Mixed mode properties of CNT reinforced composites using Arcan test rig

Jacob MUTHU

Frontiers of Structural and Civil Engineering 2015, Volume 9, Issue 4, Pages 397-404 doi: 10.1007/s11709-015-0321-y

Abstract: Composite materials reinforced with carbon nanotubes were mechanical tested using Arcan test rig underArcan test rig was designed and fabricated to work with the Shimadzu testing machine.

Keywords： CNT composites Arcan test rig stress intensity factor

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Three-Dimensional Mesoscopic Investigation on the Impact of Specimen Geometry and Bearing Strip Size Article

Zhangyu Wu, Jinhua Zhang, Hongfa Yu, Qin Fang, Haiyan Ma, Li Chen

Engineering 2022, Volume 17, Issue 10, Pages 110-122 doi: 10.1016/j.eng.2021.02.024

Abstract: investigate the static splitting-tensile behaviors of CAC under the influence of two factors, namely specimenWe established 12 different specimen models with two specimen shapes (i.e., a cube with an edge lengthThe effects of specimen geometry and strip width on the splitting-tensile properties of CAC, such asThe fst values of CAC are associated with both the specimen geometry and width of the bearing strip.

Keywords： Coral aggregate concrete 3D mesoscopic modelling Split-tension test Tensile strength Specimen geometry

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Effect of strata restraint on seismic performance of prefabricated sidewall joints in fabricated subway stations

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 5, Pages 763-779 doi: 10.1007/s11709-023-0917-6

Abstract: A disadvantage of the conventional quasi-static test method is that it does not consider the soil restraint effect. A new method to test the seismic performance of prefabricated specimens for underground assembled structures is proposed, which can realistically reflect the strata restraint effect on the underground structure. Laboratory work combined with finite element (FE) analysis is performed in this study. Three full-scale sidewall specimens with different joint forms are designed and fabricated. Indices related to the seismic performance and damage modes are analyzed comprehensively to reveal the mechanism of the strata restraint effect on the prefabricated sidewall components. Test results show that the strata restraint effect effectively improves the energy dissipation capacity, load-bearing capacity, and the recoverability of the internal deformation of the precast sidewall components. However, the strata restraint effect reduces the ductility of the precast sidewall components and aggravates the shear and bending deformations in the core region of the connection joints. Additionally, the strata restraint effect significantly affects the seismic performance and damage mode of the prefabricated sidewall components. An FE model that can be used to conduct a seismic performance study of prefabricated specimens for underground assembled structures is proposed, and its feasibility is verified via comparison with test data.

Keywords： underground structures precast sidewall specimen seismic test method bearing capacity energy dissipation

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Experimental study on compaction-induced anisotropic mechanical property of rockfill material

Xiangtao ZHANG, Yizhao GAO, Yuan WANG, Yu-zhen YU, Xun SUN

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 1, Pages 109-123 doi: 10.1007/s11709-021-0693-0

Abstract: For high-density rockfill materials, a set of specimen preparation devices for inclined compaction planesprincipal stress direction angles can change the extent of the particle interlocking effect, causing the specimen

Keywords： rockfill inclination of specimen preparation anisotropy mechanical property mechanism

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Creep-fatigue crack growth behavior in GH4169 superalloy

Dianyin HU, Xiyuan WANG, Jianxing MAO, Rongqiao WANG

Frontiers of Mechanical Engineering 2019, Volume 14, Issue 3, Pages 369-376 doi: 10.1007/s11465-018-0489-7

Abstract: This study aims to examine the crack growth behavior of turbine disc GH4169 superalloy under creep-fatigue loading. Crack growth experiments were performed on compact tension specimens using trapezoidal waveform with dwell time at the maximum load at 650 °C. The crack growth rate of GH4169 superalloy significantly increased with dwell time. The grain boundaries oxidize during the dwell process, thereby inducing an intergranular creep-fatigue fracture mode. In addition, testing data under the same dwell time showed scattering at the crack growth rate. Consequently, a modified model based on the Saxena equation was proposed by introducing a distribution factor for the crack growth rate. Microstructural observation confirmed that the small grain size and high volume fraction of the d phase led to a fast creep-fatigue crack growth rate at 650 °C, thus indicating that two factors, namely, fine grain and presence of the d phase at the grain boundary, increased the amount of weakened interface at high temperature, in which intergranular cracks may form and propagate.

Keywords： crack growth rate creep-fatigue GH4169 superalloy CT specimen dwell time

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Research on the influence of contact surface constraint on mechanical properties of rock-concrete composite specimens under compressive loads

Baoyun ZHAO, Yang LIU, Dongyan LIU, Wei HUANG, Xiaoping WANG, Guibao YU, Shu LIU

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 2, Pages 322-330 doi: 10.1007/s11709-019-0594-7

Abstract: The contact form of rock-concrete has a crucial influence on the failure characteristics of the stability of rock-concrete engineering. To study the influence of contact surface on the mechanical properties of rock-concrete composite specimens under compressive loads, the two different contact forms of rock-concrete composite specimens are designed, the mechanical properties of these two different specimens are analyzed under triaxial compressive condition, and analysis comparison on the stress-strain curves and failure forms of the two specimens is carried out. The influence of contact surface constraint on the mechanical properties of rock-concrete composite specimens is obtained. Results show that the stress and strain of rock-concrete composite specimens with contact surface constraint are obviously higher than those without. Averagely, compared with composite specimens without the contact surface, the existence of contact surface constraint can increase the axial peak stress of composite specimens by 24% and the axial peak strain by 16%. According to the characteristics of the fracture surface, the theory of microcrack development is used to explain the contact surface constraint of rock-concrete composite specimens, which explains the difference of mechanical properties between the two rock-concrete composite specimens in the experiment. Research results cannot only enrich the research content of the mechanics of rock contact, but also can serve as a valuable reference for the understanding of the corresponding mechanics mechanism of other similar composite specimens.

Keywords： rock-concrete composite specimen contact surface mechanical properties failure mechanism