Qingming Li
Beijing Institute of Technology
Penetration (firestop)Ultimate tensile strengthPhysicsEngineeringFinite element methodStrain rateComposite materialBeam (structure)Compression (physics)Materials sciencePenetration depthVibrationCompressive strengthProjectileMechanicsStructural engineeringClassical mechanicsSplit-Hopkinson pressure barShock (mechanics)Stress (mechanics)
172Publications
38H-index
4,363Citations
Publications 170
Newest
#1Zihao Chen (BIT: Beijing Institute of Technology)H-Index: 5
#2Ying Li (BIT: Beijing Institute of Technology)H-Index: 12
Last. Qingming Li (University of Manchester)H-Index: 38
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Abstract Origami metamaterial has gradually shown its potential in the fields of science and engineering due to its unique mechanical behaviors. Since hydrogel shows a positive volume change when absorbing water, it provides a new design strategy for actively deformed origami metamaterials composed of normal material framework and active hydrogel layer. In this paper, we proposed three synergistic mechanical designs with positive/negative/zero tunable swelling deformation by adjusting the openin...
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Abstract null null Wrinkling has been observed frequently in the mechanical testing of thin films or membrane structures, which may cause adverse effects on the accuracy of stress and strain measurements. To overcome this problem, a dogbone geometry design is proposed and investigated to eliminate the occurrence of wrinkling when the thin film sample is stretched in a uniaxial tensile test. A numerical experiment is carried out using finite element code to parametrically study the influence of t...
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#1Jiaming Wang (University of Manchester)H-Index: 2
#2Xing Li (Hohai University)H-Index: 1
Last. Dirk Engelberg (University of Manchester)H-Index: 21
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Abstract Using meso-structural representations of concrete, with aggregates dispersed in mortar, has become a standard approach for damage and fracture analysis. However, there is no full agreement on appropriate modelling of different phases and on the inclusion of interfacial transition zones (ITZ). This work explores different mortar and ITZ formulations and by comparison with own experiments demonstrates that the optimal strategy balancing physical realism and computational efficiency requir...
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#1Kangpei Meng (University of Manchester)
#2Qingming Li (University of Manchester)H-Index: 38
Abstract null null An analytical solution of the one-dimensional wave propagation is proposed to predict the steady-state SH wave behaviour in a one-dimensional random multi-layer medium with both periodic and non-periodic structures. A finite element model sandwiched by non-reflective boundary is also proposed and used to verify the analytical solution. Monte Carlo studies are conducted to demonstrate the influence of randomness of segment length on the wave propagation behaviour and the band s...
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#1Shunfeng Li (University of Manchester)
#2Zhi Xiao (Hunan University)H-Index: 7
Last. Qingming Li (University of Manchester)H-Index: 38
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Abstract Human head is most vulnerable in road traffic accidents involving motorcyclists where the helmet is commonly used to protect human head and reduce head injuries. This study aims to develop a methodology for the analysis of a novel motorcycle helmet based on coupled head-helmet modelling and the kinematic and biomechanical head injure criteria. A representative full-face motorcycle helmet finite element (FE) model was established and validated by the standard drop test. The validated hel...
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#1Chengxing Yang (University of Manchester)
#2Qingming Li (University of Manchester)H-Index: 38
Last. Yu Wang (University of Manchester)
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Abstract Complex and small-scale architectures, e.g., topology-optimised materials and functionally graded lattice materials (FGLMs), can be well fabricated with the assistance of additive manufacturing (AM). This work investigates the compressive properties of a functionally graded cuttlebone-like lattice (CLL) material. Experimental compression tests are performed on both uniform and graded lattice materials, which are made of Inconel 718 via selective laser melting (SLM) technology. In additi...
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#1H.J. Yang (TUT: Taiyuan University of Technology)H-Index: 3
#2Jie Zhang (TUT: Taiyuan University of Technology)H-Index: 4
Last. Qingming Li (University of Manchester)H-Index: 38
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A study on the resistance of rigid projectiles penetrating into semi-infinite concrete targets is performed in this paper. Experimental data are analyzed to examine the penetration resistance during various stages of the penetration process. A numerical tool using AUTODYN hydrocode is applied in the study. The numerical results on both deceleration-time history and depth of penetration of projectiles are in good agreement with experimental data, which demonstrate the feasibility of the numerical...
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#1Yinzhong Yan (University of Manchester)H-Index: 2
#2Qingming Li (University of Manchester)H-Index: 38
Electronic and optical products are vulnerable under mechanical shock environment. Designed products need to be validated by shock testing and/or numerical simulation, using representative acceleration-time history signals. However, specifications derived from measurements are normally given in terms of shock response spectrum (SRS) without a corresponding time history signal, and therefore, there is a need to synthesis acceleration-time histories from a given SRS specification. This paper propo...
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#1Tamer ElshenawyH-Index: 7
#2Qingming Li (University of Manchester)H-Index: 38
Last. Ahmed ElbeihH-Index: 24
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Abstract This paper studies the shaped charge jet performance in terms of different liner shapes including conical, bell, hemispherical and bi-conical liners. The critical angles and the relevant flow velocities for the zirconium liner material were calculated analytically and numerically using Autodyn hydro-code. The relationship between the critical collapse angle and the flow velocity was determined for the conditions of jet formation and coherency. Penetration tests according to the standard...
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#1C. G. Chai (CAEP: China Academy of Engineering Physics)H-Index: 1
#2Aiguo Pi (BIT: Beijing Institute of Technology)H-Index: 6
Last. F.L. Huang (BIT: Beijing Institute of Technology)H-Index: 6
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Similarity can reflect common laws in the mechanism of rigid-body penetration. In this paper, the similarities in rigid-body penetration depth are demonstrated by three non-dimensional but physically meaningful quantities, i.e., $ \rho_{\text{kinetic}} , I_{ \ln }^{*} and N^{\prime}_{1} . These three quantities represent the non-dimensional areal density of projectile kinetic energy, the effect of nose geometry, and the friction at the interactive cross section between projectile...
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