Analysis of warping defect formation mechanisms in hot molding of CF/PEEK thin-wall structures and their influence on mechanical properties

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures Pub Date : 2024-11-24 DOI:10.1016/j.tws.2024.112740

Yue Li , Aisha Yang , Yuting Liu , Yu Gao , Jianfeng Zhou , Yan Dong , Shu Zhu

{"title":"Analysis of warping defect formation mechanisms in hot molding of CF/PEEK thin-wall structures and their influence on mechanical properties","authors":"Yue Li , Aisha Yang , Yuting Liu , Yu Gao , Jianfeng Zhou , Yan Dong , Shu Zhu","doi":"10.1016/j.tws.2024.112740","DOIUrl":null,"url":null,"abstract":"<div><div>The hot molding of carbon fiber-reinforced polyether ether ketone composites (CF/PEEK) thin-wall structures employs high cooling rates, which cause uneven material shrinkage across different parts and pronounced warping defects. This study fabricated CF/PEEK thin-wall laminates with a thickness of 1.2 mm through die-pressing technology and analyzed the effects of various cooling processes on plate warping. In addition, the study elucidated the formation mechanism of warping defects in CF/PEEK thin-wall structures and plotted a cooling rate curve to determine a strategy for effectively mitigating such defects. Notably, CF/PEEK hot molding warping involves an asynchronous contraction of molecular chains of crystalline polymers, leading to thermal residual stress. This study also investigated the effects of warpage on bending properties and stability. When warpage ranged from 10 to 15 mm, the maximum bending strength deviation along the plane was approximately 150 MPa, indicating that excessive warping substantially reduces bending strength. Moreover, laminates with minor warpage differences exhibited consistent performance stability. Overall, this study provides valuable insights for enhancing the forming quality of CF/PEEK, thereby promoting their application in advanced equipment.</div></div>","PeriodicalId":49435,"journal":{"name":"Thin-Walled Structures","volume":"207 ","pages":"Article 112740"},"PeriodicalIF":5.7000,"publicationDate":"2024-11-24","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/S0263823124011807","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, CIVIL","Score":null,"Total":0}

引用次数: 0

Abstract

The hot molding of carbon fiber-reinforced polyether ether ketone composites (CF/PEEK) thin-wall structures employs high cooling rates, which cause uneven material shrinkage across different parts and pronounced warping defects. This study fabricated CF/PEEK thin-wall laminates with a thickness of 1.2 mm through die-pressing technology and analyzed the effects of various cooling processes on plate warping. In addition, the study elucidated the formation mechanism of warping defects in CF/PEEK thin-wall structures and plotted a cooling rate curve to determine a strategy for effectively mitigating such defects. Notably, CF/PEEK hot molding warping involves an asynchronous contraction of molecular chains of crystalline polymers, leading to thermal residual stress. This study also investigated the effects of warpage on bending properties and stability. When warpage ranged from 10 to 15 mm, the maximum bending strength deviation along the plane was approximately 150 MPa, indicating that excessive warping substantially reduces bending strength. Moreover, laminates with minor warpage differences exhibited consistent performance stability. Overall, this study provides valuable insights for enhancing the forming quality of CF/PEEK, thereby promoting their application in advanced equipment.

查看原文本刊更多论文

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.