International Journal of Impact Engineering最新文献_第4页

Investigation of hypervelocity impact on ceramic fiber insulation tiles: an integrated approach of numerical simulation and experimental validation 超高速冲击对陶瓷纤维保温砖的影响研究：数值模拟与实验验证相结合的方法

IF 5.1 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Impact Engineering

Pub Date : 2026-01-01 DOI: 10.1016/j.ijimpeng.2025.105633

Yiming Wang , Yesheng Zhong , Kaili Yin, Guoquan Luo, Xiaoliang Ma, Liping Shi, Xiaodong He

The thermal protection system is essential for hypersonic spacecraft safety during take-off, orbital operations, and re-entry. Ceramic fiber insulation tile (CFIT), as its key heat-resistant material, is a porous, brittle, 3D network material with complex mechanical behavior. It is typically coated with a high-emissivity coating during use and must withstand hypervelocity impact (HVI) from space debris on orbit. In this study, numerical simulation and experiment are used to study the mechanical response of CFIT under HVI. First, numerical simulation of CFIT’s HVI response was conducted using ABAQUS/Explicit, combined with the smoothed particle hydrodynamics (SPH) method and incorporating a user-defined material model (VUMAT). The validity of the model was verified by comparing the fragment cloud distribution and the maximum penetration depth obtained from numerical simulation and experiment. Second, the effects of different projectile shapes (spherical and cubic) and sizes on the impact response of CFIT were investigated, with systematic analysis of CFIT’s velocity/mass loss, maximum penetration depth, and stress distribution. Furthermore, based on the established model, the material thickness required to effectively resist space debris HVI was determined. This was achieved by analyzing the velocity dissipation and energy absorption characteristics of spherical projectile under different impact velocities and thickness conditions. Finally, the impact failure mechanism of coated CFIT was studied and the optimal coating thickness was specified. Overall, this study can provide theoretical guidance for the thickness design of CFIT and its surface coating to resist HVI in spacecraft.

热防护系统对高超声速航天器在起飞、轨道运行和再入期间的安全至关重要。陶瓷纤维保温砖是一种多孔、脆性、力学性能复杂的三维网状材料，是其关键的耐热材料。在使用过程中，它通常涂有一层高发射率涂层，并且必须承受轨道上空间碎片的超高速撞击。本文采用数值模拟和试验相结合的方法，研究了HVI作用下CFIT的力学响应。首先，利用ABAQUS/Explicit，结合光滑颗粒流体力学（SPH）方法，结合用户自定义材料模型（VUMAT），对CFIT的HVI响应进行了数值模拟。通过对比数值模拟和实验得到的碎片云分布和最大穿透深度，验证了模型的有效性。其次，研究了不同弹丸形状（球形和立方）和尺寸对CFIT冲击响应的影响，系统分析了CFIT的速度/质量损失、最大侵彻深度和应力分布。在此基础上，确定了有效抵抗空间碎片HVI所需的材料厚度。通过分析球面弹丸在不同冲击速度和厚度条件下的速度耗散和能量吸收特性，得出了这一结论。最后，研究了涂层CFIT的冲击破坏机理，确定了涂层的最佳厚度。综上所述，本研究可为航天器CFIT的厚度设计及表面涂层抗HVI提供理论指导。

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引用次数: 0

LMVGM and VBW plasticity model with the coupling effect between strain rate and stress state for mild steel 考虑应变速率和应力状态耦合效应的低碳钢LMVGM和VBW塑性模型

IF 5.1 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Impact Engineering

Pub Date : 2025-12-29 DOI: 10.1016/j.ijimpeng.2025.105632

Ya-Chao Hu , Zhi-Jie Wu , Yu-Chao Yang , Feng Xi , Feng Liu , Ying-Hua Tan

Accurate prediction of the dynamic plastic deformation and ductile fracture behavior of mild steel is essential for progressive collapse analysis of building structures. In this study, the VBW plasticity model was extended to a rate-dependent form by incorporating the strain-rate effect, enabling the accurate representation of large plastic deformations under impact loading conditions. Furthermore, the LMVGM was reformulated into a rate-dependent form by introducing the coupled effect between strain rate and stress state into its fracture surface expression, thereby enhancing its capability to describe fracture evolution under dynamic loading conditions. On this basis, dynamic tensile tests were conducted on flat specimens with various notch configurations using a drop-weight impact system, covering a loading range from quasi-static to the intermediate strain-rate regime. Comparative analysis between numerical and experimental results demonstrated that the proposed models could accurately reproduce the load–displacement responses and fracture characteristics across different stress states and strain rates, confirming their reliability and applicability in predicting the dynamic plasticity and failure behavior of Q355 mild steel in the intermediate strain-rate regime.

准确预测低碳钢的动态塑性变形和韧性断裂行为，对建筑结构的渐进倒塌分析至关重要。在本研究中，通过纳入应变率效应，将VBW塑性模型扩展为速率依赖的形式，从而能够准确表征冲击载荷条件下的大塑性变形。此外，通过将应变速率与应力状态的耦合效应引入到LMVGM的断裂面表达式中，将LMVGM重新表述为速率相关的形式，从而增强了其描述动态加载条件下断裂演化的能力。在此基础上，采用落重冲击系统对具有不同缺口配置的平面试件进行了动态拉伸试验，涵盖了从准静态到中间应变率的加载范围。数值与实验结果对比分析表明，所建立的模型能够准确再现不同应力状态和应变速率下的载荷-位移响应和断裂特征，验证了该模型在预测Q355低碳钢中应变速率动态塑性和破坏行为方面的可靠性和适用性。

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引用次数: 0

Impact load reduction in water-entry vehicles enabled by Re-entrant Hexagonal lattice structures 通过重入式六边形晶格结构，降低了入水车辆的冲击载荷

IF 5.1 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Impact Engineering

Pub Date : 2025-12-29 DOI: 10.1016/j.ijimpeng.2025.105631

Huanyu Li , Shengjie Sun , Xiao Kang , Liyou Lian , Yexian Wang , Hongyuan Li , Ying Li

Cross-medium vehicles, as a new class of platforms capable of high-speed operation in both air and water, face a critical challenge of excessive peak impact loads during oblique water entry. Conventional cushioning materials generally suffer from low energy absorption efficiency and insufficient structural stability under such extreme conditions, rendering them inadequate for engineering applications. To address this issue, this study proposes a load-mitigation strategy based on a Re-entrant Hexagonal (REH) lattice structure. Benefiting from its low weight, high strength, high specific energy absorption, and geometric design flexibility, the proposed lattice effectively attenuates water-entry impact loads. The oblique water-entry load characteristics were first captured using a dedicated cross-medium experimental platform, while the lattice parameters were optimized through a particle swarm optimization–support vector machine (PSO–SVM) algorithm. Subsequently, a finite element model employing an equivalent loading method was developed to elucidate the dynamic response mechanisms, leading to the design of an embedded lattice-based load-mitigation nose cap. Experimental validation demonstrated that the proposed structure achieved a 50.6% reduction in peak load through progressive plastic buckling, multi-hinge formation, and energy dissipation. Overall, this study clarifies the water-entry load-mitigation mechanism of REH lattices and provides theoretical and technical support for the impact protection design of cross-medium vehicles.

跨介质车辆作为一种能够在空中和水中高速运行的新型平台，面临着斜入水时峰值冲击载荷过大的严峻挑战。在这种极端条件下，传统的缓冲材料普遍存在能量吸收效率低、结构稳定性不足的问题，不适合工程应用。为了解决这一问题，本研究提出了一种基于可重入六边形（REH）晶格结构的负载缓解策略。得益于其轻重量、高强度、高比能吸收和几何设计的灵活性，所提出的晶格有效地衰减了水进入冲击载荷。首先利用专用的跨介质实验平台捕获斜进水荷载特征，并通过粒子群优化-支持向量机（PSO-SVM）算法对晶格参数进行优化。随后，采用等效加载方法建立了有限元模型来阐明动态响应机制，从而设计了基于嵌入式网格的减载鼻帽。实验验证表明，该结构通过渐进式塑性屈曲、多铰形成和能量耗散实现了50.6%的峰值载荷降低。总体而言，本研究明确了REH格架的入水减载机理，为跨介质车辆防撞设计提供了理论和技术支持。

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引用次数: 0

In-situ damage assessment of impacted concrete structures using self-sensing reinforcements 基于自感知钢筋的冲击混凝土结构原位损伤评估

IF 5.1 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Impact Engineering

Pub Date : 2025-12-25 DOI: 10.1016/j.ijimpeng.2025.105622

Zhongfeng Zhu , Zenghui Ye , Yingwu Zhou , Feng Xing

While existing methods offer guidance for designing concrete structures against impact loads, however, under varying impact energy levels, the damage state of structures poses significant challenges for quantification and assessment, especially when no clearly visible cracks or spalling are present on the structural surface. This study proposes and validates a novel self-sensing steel-FRP composite bar (SFCB)-RC beam that integrates impact resistance with damage monitoring. Through combined drop-weight impact tests, post-impact residual static tests, and high-fidelity finite element simulations, we demonstrate that SFCB reinforcement significantly enhances structural recoverability and damage control compared to conventional steel rebar, attributable to its stable post-yield stiffness. The self-sensing capability of SFCBs successfully correlates distributed residual strain patterns with structural resilience, enabling effective post-impact assessment. A comprehensive parametric analysis identifies a post-yield stiffness ratio of 0.07 as a critical threshold for optimizing resilience. Furthermore, a quantitative predictive model is established, explicitly linking the restitution coefficient to the equivalent reinforcement ratio and post-yield stiffness ratio, thus providing a vital tool for the performance-based design of impact-resilient structures. Finally, a performance-based design framework is established to guide the development of impact-resilient SFCB-RC beams with built-in health monitoring functions.

虽然现有的方法为设计抗冲击荷载的混凝土结构提供了指导，但是，在不同的冲击能量水平下，结构的损伤状态对量化和评估提出了重大挑战，特别是当结构表面没有明显可见的裂缝或剥落时。本研究提出并验证了一种集抗冲击与损伤监测于一体的新型自传感钢- frp复合杆(SFCB)-RC梁。通过联合落重冲击试验、冲击后残余静力试验和高保真有限元模拟，研究人员证明，由于SFCB钢筋具有稳定的屈服后刚度，与传统钢筋相比，SFCB钢筋显著提高了结构的可恢复性和损伤控制能力。sfcb的自感知能力成功地将分布的残余应变模式与结构弹性相关联，从而实现有效的影响后评估。综合参数分析确定了0.07的屈服后刚度比作为优化弹性的关键阈值。建立了定量预测模型，将恢复系数与等效配筋率和屈服后刚度比明确地联系起来，为冲击弹性结构的性能化设计提供了重要工具。最后，建立了基于性能的设计框架，以指导具有内置健康监测功能的冲击弹性sfc - rc梁的开发。

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引用次数: 0

Characterizing and modeling penetration tracks in silica aerogel for cosmic dust capture via laser-induced microparticle impact test 用激光诱导微粒撞击试验对宇宙尘埃捕获用二氧化硅气凝胶的穿透轨迹进行表征和建模

IF 5.1 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Impact Engineering

Pub Date : 2025-12-23 DOI: 10.1016/j.ijimpeng.2025.105621

Liping Xiao , Yaxin Zhu , Haifeng Zhao , Ke Wang

Silica aerogel is an ideal medium for capturing hypervelocity cosmic dusts scattered throughout the solar system. The impact velocity, direction, and initial size of captured particles can be derived from the penetration tracks, which are essential for determining their parent sources and history. The formation mechanism of penetration tracks has not been fully understood, hindering modeling the correlation between track morphologies and projectile parameters accurately. In this work, a laser-driven microparticle launch system is constructed. The ballistic impact experiments are carried out on low density silica aerogel (80 kg·m^-3) with spherical projectiles at 100∼900 m·s^-1. Via in-situ observation, the energy dissipation and track formation mechanism are discussed. Based on the clarified mechanism, an analytical model considering target strength as well as hydrodynamic force is proposed. To further understand the experimental observations and conduct parametric studies, numerical simulations are performed with the JH-2 constitutive model and Kelvin cell. Experimental validation confirms the high reliability of both the simulation and theoretical model. The theoretical model achieves an accuracy of up to 90% across a wide range of impact velocities (from 0.1 to 6 km·s^-1). The effects of projectile parameters on induced tracks are investigated with the verified models. The findings demonstrate that projectile parameters can be inferred from the track morphologies generated in orbit by interplanetary dust particles. Both theoretical and simulation models presented in this study offers a robust analytical framework for analyzing and determining the origins of cosmic dusts.

二氧化硅气凝胶是捕获散布在太阳系中的超高速宇宙尘埃的理想介质。撞击速度、方向和捕获颗粒的初始大小可以从穿透轨迹中得到，这对于确定它们的母源和历史是必不可少的。侵彻弹道的形成机理尚未完全了解，这阻碍了弹道形态与弹丸参数之间关系的准确建模。本文构建了一个激光驱动的微粒发射系统。用低密度二氧化硅气凝胶（80 kg·m-3）与100 ~ 900 m·s-1的球形弹丸进行了弹道冲击实验。通过现场观测，讨论了能量耗散和轨迹形成机理。在阐明其机理的基础上，提出了考虑目标强度和水动力的解析模型。为了进一步了解实验结果并进行参数化研究，采用JH-2本构模型和开尔文单元进行了数值模拟。实验验证了仿真和理论模型的高可靠性。该理论模型在很大的冲击速度范围内（从0.1到6 km·s-1）实现了高达90%的精度。利用验证的模型，研究了弹丸参数对诱导轨迹的影响。研究结果表明，弹丸参数可以从行星际尘埃颗粒在轨道上产生的轨迹形态中推断出来。本研究提出的理论和模拟模型为分析和确定宇宙尘埃的起源提供了一个强大的分析框架。

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引用次数: 0

Impact behaviour and residual displacement mitigation of precast hybrid reinforced concrete (HRC) bridge columns 预制混合钢筋混凝土（HRC）桥柱的冲击特性和残余位移减缓

IF 5.1 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Impact Engineering

Pub Date : 2025-12-22 DOI: 10.1016/j.ijimpeng.2025.105619

Zhong-Kui Cai , Scott T. Smith , T. Tafsirojjaman , Bing Zhang , Daiyu Wang , Duo Liu , Wei Yuan , Da Li

Precast reinforced concrete (RC) bridge columns have been widely adopted in modern bridge construction, yet their impact behaviour remains insufficiently investigated. Studies addressing the reduction of post-impact residual displacement in precast bridge columns are particularly scarce. In previous work by the first author[1], a precast hybrid reinforced concrete (HRC) bridge column incorporating both normal-strength and high-strength steel reinforcement was proposed, with its superior self-centering performance under lateral cyclic loading experimentally demonstrated. The present study further investigates the impact behaviour and post-impact residual displacement of HRC precast bridge columns. A similitude-based design framework was developed for the lateral impact test programme, effectively bridging experimental and prototype conditions. One RC and two HRC precast bridge columns were tested, with the proportion of high-strength reinforcement as the key variable. Each specimen was subjected to three impacts of increasing velocity. Test results demonstrated that, compared to the precast RC specimen, the hybrid reinforcement in HRC specimens effectively prevented opening of the precast column-base joint and mitigated impact damage. The hybrid reinforcement reduced peak displacement by up to 22% and post-impact residual displacement by up to 50%. The mechanisms underlying this reduction in residual displacement were also clarified. Furthermore, a comprehensive numerical model was developed and validated against experimental results. Parametric analyses were subsequently conducted to investigate the impact behaviour of precast HRC columns under varying conditions. The numerical study examined the effects of impact height and tensile strength of high-strength reinforcement on the impact response and post-impact residual displacement.

预制钢筋混凝土桥柱在现代桥梁建设中被广泛采用，但对其冲击性能的研究还不够。关于减少预制桥柱冲击后残余位移的研究尤其少。在第一作者[1]之前的工作中，提出了一种预制混合钢筋混凝土（HRC）桥柱，其中包括标准强度和高强度钢筋，并通过实验证明其在横向循环荷载下具有优越的自定心性能。本研究进一步研究了HRC预制桥柱的冲击行为和冲击后残余位移。为横向冲击试验方案开发了一个基于相似性的设计框架，有效地连接了实验和原型条件。以高强配筋比例为关键变量，对1根RC和2根HRC预制桥柱进行了试验。每个试样受到三次速度递增的冲击。试验结果表明，与预制RC试件相比，HRC试件中的混合配筋有效地阻止了预制柱-基础节点的打开，减轻了冲击损伤。混合钢筋将峰值位移减少了22%，碰撞后残余位移减少了50%。这种减少残余位移的机制也得到了澄清。建立了综合数值模型，并与实验结果进行了对比验证。随后进行了参数分析，以调查预制HRC柱在不同条件下的冲击行为。数值研究了高强度钢筋的冲击高度和抗拉强度对冲击响应和冲击后残余位移的影响。

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引用次数: 0

Replacing strain gages by line camera DIC in Hopkinson bar experiments 在霍普金森杆实验中用线相机DIC代替应变片

IF 5.1 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Impact Engineering

Pub Date : 2025-12-22 DOI: 10.1016/j.ijimpeng.2025.105620

Christian C. Roth , Foulques LeGrelle , Thomas Tancogne-Dejean , Vincent Grolleau , Dirk Mohr

Strain gages are widely used to acquire the signals in dynamic experiments with Hopkinson bars. Here, we explore the potential of displacement history measurements with line camera based digital image correlation (DIC) to substitute the role of strain gages and directly obtain particle velocity. After outlining the fundamental equations for deriving stress-strain curves, the technique is applied and validated through split-Hopkinson bar compression and tension tests, as well as direct impact experiments. In direct impact tests, the line camera enables simultaneous measurement of input and output forces, facilitating the verification of quasi-static equilibrium. Moreover, in cases where quasi-static equilibrium is clearly satisfied, a single line camera measurement on the striker bar is sufficient to determine the entire stress-strain curve. Compared to laser interferometry and photon Doppler velocimetry, the line camera DIC system demonstrates superior capability in measuring large displacements of Hopkinson bars. It also offers a reliable non-contact measurement alternative to strain gages, which are prone to delamination under high-impact conditions.

在霍普金森杆动态试验中，应变片被广泛用于获取信号。在这里，我们探索了基于线相机的数字图像相关（DIC）的位移历史测量的潜力，以取代应变片的作用，直接获得粒子速度。在概述了推导应力应变曲线的基本方程后，通过劈裂霍普金森杆压缩和拉伸试验以及直接冲击试验对该技术进行了应用和验证。在直接冲击测试中，线相机可以同时测量输入和输出力，便于准静态平衡的验证。此外，在准静态平衡明显满足的情况下，在打击棒上的单线相机测量足以确定整个应力-应变曲线。与激光干涉测量和光子多普勒测速相比，线相机DIC系统在测量霍普金森杆的大位移方面表现出优越的能力。它还提供了可靠的非接触式测量替代应变片，应变片在高冲击条件下容易分层。

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引用次数: 0

Protective mechanism of high-entropy bulk metallic glass against hypervelocity impact 高熵大块金属玻璃对超高速冲击的保护机理

IF 5.1 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Impact Engineering

Pub Date : 2025-12-22 DOI: 10.1016/j.ijimpeng.2025.105618

Xianzhe Zhong , Qingming Zhang , Mingze Wu , Yanxiang Liang , Renrong Long , Lin Jing

As an advanced bumper material, high-entropy bulk metallic glass (HE-BMG) exhibits excellent protective performance against hypervelocity impact (HVI). To comprehensively understand the protective mechanism of HE-BMG against HVI, based on the analysis of the effects of material properties on HVIs, numerical simulates of Al2024 spherical projectiles hypervelocity impacting on Al2024 and HE-BMG bumpers were conducted over a wide range of bumper areal densities (0.14–0.84 g/cm²) and impact velocities (2.5–6.5 km/s). The results were quantified using secondary development and self-compiled programs. Combined with experimental results and theoretical calculations, a detailed comparison was made between the two bumpers in terms of projectile and bumper materials fragmentation, dispersion, energy dissipation, and phase transition. The results demonstrate that the HE-BMG bumper is beneficial to increasing the shock pressure and promoting the failure and fragmentation of materials. Unlike the Al2024 bumper, which produce fragments more threatening than projectile upon shattering, the HE-BMG bumper debris cloud exhibits a more uniform and consistently lower load distribution on the rear wall. Moreover, the HE-BMG bumper can reduce the average velocity of the projectile debris cloud, increase its expansion velocity and spray half-angle, thereby increasing the impact area and decreasing the load density of the debris cloud acting on the rear wall. Finally, the HE-BMG bumper induces phase transitions in projectile and bumper materials at lower impact velocities, which helps reduce the penetration capability of the debris cloud to the rear wall.

高熵大块金属玻璃（HE-BMG）作为一种先进的保险杠材料，对超高速碰撞（HVI）具有优异的防护性能。为全面了解HE-BMG对HVI的防护机理，在分析材料性能对HVI影响的基础上，在较宽的缓冲器面密度（0.14 ~ 0.84 g/cm2）和冲击速度（2.5 ~ 6.5 km/s）范围内，对Al2024球形弹丸超高速撞击Al2024和HE-BMG缓冲器进行了数值模拟。使用二次开发和自编译程序对结果进行量化。结合实验结果和理论计算，对两种缓冲器在弹丸和缓冲器材料破碎、弥散、能量耗散和相变等方面进行了详细的比较。结果表明，HE-BMG保险杠有利于提高冲击压力，促进材料的破坏和破碎。与Al2024缓冲器不同的是，在破碎时产生的碎片比弹丸更具威胁性，HE-BMG缓冲器碎片云在后壁上表现出更均匀和持续的低载荷分布。此外，HE-BMG缓冲器可以降低弹丸碎片云的平均速度，增加其膨胀速度和喷射半角，从而增加撞击面积，降低作用在后壁上的碎片云载荷密度。最后，HE-BMG缓冲器在较低的冲击速度下诱导弹丸和缓冲器材料发生相变，这有助于降低碎片云对后壁的侵彻能力。

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引用次数: 0

Reliability-based evaluation of Cross-Laminated Timber (CLT) ballistic resistance for performance prediction and design 基于可靠性评估的交叉层合木材（CLT）抗弹道性能预测与设计

IF 5.1 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Impact Engineering

Pub Date : 2025-12-19 DOI: 10.1016/j.ijimpeng.2025.105617

Juliet Swinea , Iris Tien , Peter Stynoski , Lauren K. Stewart

Cross-laminated timber (CLT) is a promising sustainable building material for temporary and permanent military applications. Experimental research in the past decade informed design guidance for CLT components against blast loading and forced entry, but formal guidance for CLT systems under ballistic impact is not currently available partly due to inherent uncertainties affecting localized resistance. In this article, we investigate the impact of quasi-static wood material property variability on partial penetration ballistic resistance uncertainty by conducting 61 total ballistic impact experiments on an untested prominent structural species, Douglas Fir (DF). With the DF experimental results in combination with a leveraged CLT ballistic and material property database, we predict and characterize the ballistic resistance of any CLT panel using a defined single penetration depth equation and the computationally inexpensive reliability-based First-Order Second-Moment (FOSM) method. We use this approach to characterize and capture the inherent variability of CLT under ballistic impact, and represent resistance profiles as probabilistic distributions rather than single values. We apply the predictive method at different scales, from DF panel-specific single velocity estimates to full species partial penetration profiles. For each data grouping, the FOSM prediction fully captured within 95% confidence intervals the experimental dataset. Needing only two easily obtained wood material properties, the method provides accurate and robust predictions of the resistance of this variable material under dynamic localized loading. As a result, we argue predicted baseline resistance profiles considering inherent material variability can act as the informed starting point for decision makers to apply situation dependent design safety factors.

交叉层压木材（CLT）是一种很有前途的可持续建筑材料，可用于临时和永久军事用途。过去十年的实验研究为CLT组件抗爆炸载荷和强行进入的设计提供了指导，但由于固有的不确定性影响局部阻力，目前还没有针对CLT系统在弹道冲击下的正式指导。在本文中，我们研究了准静态木材材料性能变化对部分穿透弹道阻力不确定性的影响，通过对未测试的著名结构树种花旗松（DF）进行61次总弹道冲击实验。将DF实验结果与杠杆CLT弹道和材料特性数据库相结合，我们使用定义的单一侵彻深度方程和计算成本低廉的基于可靠性的一阶二阶矩（FOSM）方法预测和表征任何CLT面板的弹道阻力。我们使用这种方法来表征和捕捉弹道冲击下CLT的固有变异性，并将阻力曲线表示为概率分布而不是单一值。我们在不同的尺度上应用预测方法，从DF面板特定的单速度估计到全物种部分渗透剖面。对于每个数据分组，FOSM预测在实验数据集的95%置信区间内完全捕获。该方法只需要两种容易获得的木材材料性能，就可以准确、可靠地预测这种可变材料在动态局部载荷下的阻力。因此，我们认为，考虑到固有材料的可变性，预测的基线阻力曲线可以作为决策者应用情境相关设计安全系数的知情起点。

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引用次数: 0

Underwater impulsive response of a metallic negative Poisson's ratio assembled composite structure 金属负泊松比组合复合材料结构的水下脉冲响应

IF 5.1 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Impact Engineering

Pub Date : 2025-12-15 DOI: 10.1016/j.ijimpeng.2025.105615

Lei-Lei Fei , Jin-Shui Yang , Cong Zhang , Wei-Jing Wang , Wei-Ming Zhang , Li Ma , Wei Zhang

The traditional negative Poisson's ratio structures have the unique advantages of high shear strength and specific energy absorption, but they usually lack load-bearing units in the transverse direction, resulting in relatively weak load-bearing capacity during the large deformation stage. In this paper, two types of metallic negative Poisson's ratio assembled composite structures are designed by assembling re-entrant honeycomb cells and double-arrow cells with deflection: the re-entrant double-arrow assembled composite structure and the asymmetrical re-entrant double-arrow assembled composite structure. Single-layer and double-layer metallic NPR assembled composite structures were fabricated using bending-vacuum brazing technology. Meanwhile, an experimental method was used to study the deformation mechanism of assembled composite structures under underwater impulsive loading by utilizing flying plate to strike pistons in a water tank, thereby generating shock wave pulses similar to those produced by explosive detonations. The impact process was numerically simulated using the Euler-Lagrange coupled method, and the simulation results agreed well with the experimental data. The results show that the deformation of the assembled structure's back plate is significantly reduced compared to the conventional re-entrant hexagonal honeycomb. Moreover, foam filling of the assembled structure greatly enhances its impact resistance. The research findings can provide valuable insights for the design of novel protective structures.

传统负泊松比结构具有高抗剪强度和比能吸收的独特优势，但通常缺乏横向承载单元，导致大变形阶段的承载能力相对较弱。本文设计了两种金属负泊松比组合复合材料结构，分别是重入式双箭头组合复合材料结构和带偏转的双箭头组合复合材料结构。采用弯曲真空钎焊技术制备了单层和双层金属NPR组合复合材料结构。同时，采用实验方法研究了水下脉冲载荷作用下组合复合材料结构的变形机理，利用飞板撞击水箱内的活塞，产生类似于炸药爆轰产生的激波脉冲。采用欧拉-拉格朗日耦合方法对撞击过程进行了数值模拟，模拟结果与实验数据吻合较好。结果表明，与传统的可入式六角形蜂窝结构相比，组合式结构的后板变形明显减小。此外，拼装结构的泡沫填充大大提高了其抗冲击性。研究结果可为新型防护结构的设计提供有价值的参考。

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引用次数: 0