{"title":"增材制造聚合物插件对建筑安全帽冲击响应的影响","authors":"Andrew Miceli, Grant Bevil, J. Simsiriwong","doi":"10.1108/jedt-02-2024-0086","DOIUrl":null,"url":null,"abstract":"Purpose\nStruck-by accidents (i.e. being hit by a falling object) are a leading cause of traumatic brain injuries in the construction industry. Despite the critical role of hard hats in minimizing such injuries, their overall design has not appreciably changed in decades. Therefore, this study aims to explore the potential benefits of modifying commercially available hard hat designs by incorporating a compliant cantilever and a sacrificial, energy-absorbing structure to enhance their protective capabilities against impacts.\n\nDesign/methodology/approach\nThis study involved conducting experimental impact tests to obtain the head acceleration attenuation using hard hats with a variety of compliant cantilever lattice insert designs. These lattice inserts were additively manufactured using three polymeric materials, including polylactide (PLA), acrylonitrile butadiene styrene, high-impact polystyrene and three porosity levels. A Hybrid III head/neck assembly was fitted with each hard hat design, and experimental drop tests were conducted using a 1.8-kg steel impactor dropped from 1.83 m. The maximum acceleration and head injury criterion (HIC) values were obtained for each test.\n\nFindings\nAnalysis of variance revealed that HIC was significantly reduced for all lattices with 56% porosity (p < 0.023) compared to the control (unmodified) hard hat. The most effective insert was found to be a PLA insert with 56% porosity, which reduced the HIC value by 38% compared to the control (unmodified) hard hat, with a statistically significant p-value of 0.018.\n\nOriginality/value\nThe data present in this study reveals that simple and inexpensive modifications can be made to existing hard hat designs to reduce injury risk from overhead impacts.\n","PeriodicalId":514531,"journal":{"name":"Journal of Engineering, Design and Technology","volume":"12 48","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Effect of additively manufactured polymeric inserts on impact response of construction safety helmets\",\"authors\":\"Andrew Miceli, Grant Bevil, J. 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These lattice inserts were additively manufactured using three polymeric materials, including polylactide (PLA), acrylonitrile butadiene styrene, high-impact polystyrene and three porosity levels. A Hybrid III head/neck assembly was fitted with each hard hat design, and experimental drop tests were conducted using a 1.8-kg steel impactor dropped from 1.83 m. The maximum acceleration and head injury criterion (HIC) values were obtained for each test.\\n\\nFindings\\nAnalysis of variance revealed that HIC was significantly reduced for all lattices with 56% porosity (p < 0.023) compared to the control (unmodified) hard hat. The most effective insert was found to be a PLA insert with 56% porosity, which reduced the HIC value by 38% compared to the control (unmodified) hard hat, with a statistically significant p-value of 0.018.\\n\\nOriginality/value\\nThe data present in this study reveals that simple and inexpensive modifications can be made to existing hard hat designs to reduce injury risk from overhead impacts.\\n\",\"PeriodicalId\":514531,\"journal\":{\"name\":\"Journal of Engineering, Design and Technology\",\"volume\":\"12 48\",\"pages\":\"\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2024-07-16\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Engineering, Design and Technology\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1108/jedt-02-2024-0086\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Engineering, Design and Technology","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1108/jedt-02-2024-0086","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
摘要
目的撞击事故(即被坠落物体击中)是建筑行业脑外伤的主要原因。尽管防护帽在减少此类伤害方面起着至关重要的作用,但几十年来,防护帽的整体设计并没有明显改变。因此,本研究旨在探索通过加入顺应性悬臂和牺牲性吸能结构来改进市售防护帽设计的潜在益处,以增强其对冲击的防护能力。这些格子嵌入件是使用三种聚合物材料(包括聚乳酸(PLA)、丙烯腈-丁二烯-苯乙烯、高抗冲聚苯乙烯)和三种孔隙率水平进行加成制造的。每种硬质防护帽设计都安装了混合 III 头颈组件,并使用从 1.83 米处落下的 1.8 千克钢制冲击器进行了跌落试验。结果方差分析显示,与对照组(未修改)硬质帽相比,孔隙率为 56% 的所有晶格的 HIC 都显著降低(p < 0.023)。发现最有效的插入物是孔隙率为 56% 的聚乳酸插入物,与对照组(未修改)防护帽相比,其 HIC 值降低了 38%,p 值为 0.018,具有统计学意义。
Effect of additively manufactured polymeric inserts on impact response of construction safety helmets
Purpose
Struck-by accidents (i.e. being hit by a falling object) are a leading cause of traumatic brain injuries in the construction industry. Despite the critical role of hard hats in minimizing such injuries, their overall design has not appreciably changed in decades. Therefore, this study aims to explore the potential benefits of modifying commercially available hard hat designs by incorporating a compliant cantilever and a sacrificial, energy-absorbing structure to enhance their protective capabilities against impacts.
Design/methodology/approach
This study involved conducting experimental impact tests to obtain the head acceleration attenuation using hard hats with a variety of compliant cantilever lattice insert designs. These lattice inserts were additively manufactured using three polymeric materials, including polylactide (PLA), acrylonitrile butadiene styrene, high-impact polystyrene and three porosity levels. A Hybrid III head/neck assembly was fitted with each hard hat design, and experimental drop tests were conducted using a 1.8-kg steel impactor dropped from 1.83 m. The maximum acceleration and head injury criterion (HIC) values were obtained for each test.
Findings
Analysis of variance revealed that HIC was significantly reduced for all lattices with 56% porosity (p < 0.023) compared to the control (unmodified) hard hat. The most effective insert was found to be a PLA insert with 56% porosity, which reduced the HIC value by 38% compared to the control (unmodified) hard hat, with a statistically significant p-value of 0.018.
Originality/value
The data present in this study reveals that simple and inexpensive modifications can be made to existing hard hat designs to reduce injury risk from overhead impacts.