Dual-plateau crashworthiness characteristics of star-shaped honeycombs with non-conventional semicircular ligaments

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures Pub Date : 2026-05-01 Epub Date: 2026-02-17 DOI:10.1016/j.tws.2026.114684

Liu Rong , Zhong Yifeng , Tang Yuxin , Poh Leong Hien

{"title":"Dual-plateau crashworthiness characteristics of star-shaped honeycombs with non-conventional semicircular ligaments","authors":"Liu Rong , Zhong Yifeng , Tang Yuxin , Poh Leong Hien","doi":"10.1016/j.tws.2026.114684","DOIUrl":null,"url":null,"abstract":"<div><div>This study proposes a novel star-shaped honeycomb with non-conventional semicircular ligaments (SH-SL), characterized by an asymmetric ligament design where the horizontal semicircular ligament (HSL) acts as a deformation trigger to program a sequential collapse. Through combined experimental, numerical, and theoretical analyses, the SH-SL exhibits a stable dual-plateau compressive response: an initial plateau governed by progressive bending of the HSL, followed by a secondary stress elevation due to inclined-wall contact and engagement of vertical ligaments. A newly introduced dimensionless collision coefficient enables the a priori classification of deformation into contact or non-contact modes, leading to more accurate stress predictions. Theoretical models for elastic modulus and dual-plateau stresses are developed and validated. Parametric studies reveal that reducing the HSL radius promotes controlled wall contact, activating the second plateau and significantly enhancing post-yield performance. Compared to the traditional star-shaped honeycomb (TSH), the optimized SH-SL achieves nearly double the plateau stress and a 3.5-fold increase in specific energy absorption, while also demonstrating a 5.5 times higher elastic modulus. These advancements position the SH-SL as a promising lightweight metamaterial for impact-protection applications requiring high stiffness and superior energy absorption.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"224 ","pages":"Article 114684"},"PeriodicalIF":6.6000,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Thin-Walled Structures","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0263823126002090","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2026/2/17 0:00:00","PubModel":"Epub","JCR":"Q1","JCRName":"ENGINEERING, CIVIL","Score":null,"Total":0}

引用次数: 0

Abstract

This study proposes a novel star-shaped honeycomb with non-conventional semicircular ligaments (SH-SL), characterized by an asymmetric ligament design where the horizontal semicircular ligament (HSL) acts as a deformation trigger to program a sequential collapse. Through combined experimental, numerical, and theoretical analyses, the SH-SL exhibits a stable dual-plateau compressive response: an initial plateau governed by progressive bending of the HSL, followed by a secondary stress elevation due to inclined-wall contact and engagement of vertical ligaments. A newly introduced dimensionless collision coefficient enables the a priori classification of deformation into contact or non-contact modes, leading to more accurate stress predictions. Theoretical models for elastic modulus and dual-plateau stresses are developed and validated. Parametric studies reveal that reducing the HSL radius promotes controlled wall contact, activating the second plateau and significantly enhancing post-yield performance. Compared to the traditional star-shaped honeycomb (TSH), the optimized SH-SL achieves nearly double the plateau stress and a 3.5-fold increase in specific energy absorption, while also demonstrating a 5.5 times higher elastic modulus. These advancements position the SH-SL as a promising lightweight metamaterial for impact-protection applications requiring high stiffness and superior energy absorption.

查看原文本刊更多论文

具有非常规半圆形韧带的星形蜂窝的双平台耐撞特性

本研究提出了一种具有非常规半圆韧带（SH-SL）的新型星形蜂窝，其特点是不对称的韧带设计，其中水平半圆韧带（HSL）作为变形触发器来编程顺序崩溃。通过结合实验、数值和理论分析，SH-SL表现出稳定的双平台压缩响应：最初的平台由HSL的渐进弯曲控制，随后是由于斜壁接触和垂直韧带接合而产生的二次应力升高。新引入的无因次碰撞系数可以将变形先验地分类为接触或非接触模式，从而更准确地预测应力。建立并验证了弹性模量和双平台应力的理论模型。参数研究表明，减小HSL半径可促进可控壁面接触，激活第二平台，显著提高屈服后性能。与传统的星形蜂窝（TSH）相比，优化后的星形蜂窝的平台应力提高了近一倍，比能吸收提高了3.5倍，弹性模量提高了5.5倍。这些进步使SH-SL成为一种有前途的轻质超材料，适用于需要高刚度和卓越能量吸收的冲击保护应用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Thin-Walled Structures 工程技术-工程：土木

CiteScore

9.60

自引率

20.30%

发文量

801

审稿时长

66 days

期刊介绍： Thin-walled structures comprises an important and growing proportion of engineering construction with areas of application becoming increasingly diverse, ranging from aircraft, bridges, ships and oil rigs to storage vessels, industrial buildings and warehouses. Many factors, including cost and weight economy, new materials and processes and the growth of powerful methods of analysis have contributed to this growth, and led to the need for a journal which concentrates specifically on structures in which problems arise due to the thinness of the walls. This field includes cold– formed sections, plate and shell structures, reinforced plastics structures and aluminium structures, and is of importance in many branches of engineering. The primary criterion for consideration of papers in Thin–Walled Structures is that they must be concerned with thin–walled structures or the basic problems inherent in thin–walled structures. Provided this criterion is satisfied no restriction is placed on the type of construction, material or field of application. Papers on theory, experiment, design, etc., are published and it is expected that many papers will contain aspects of all three.