Fracture Mechanics Applications最新文献

Probe on Rupture Theory of Soft-Matter Quasicrystals 软物质准晶体断裂理论探讨

Fracture Mechanics Applications Pub Date : 2020-09-23 DOI: 10.5772/INTECHOPEN.89813

Hui Cheng, T. Fan

引用次数: 1

The Mechanism of Misalignment of Saw Cutting Crack of Concrete Pavement 混凝土路面锯切裂缝错位机理研究

Fracture Mechanics Applications Pub Date : 2020-02-14 DOI: 10.5772/intechopen.91149

C. Niken

引用次数: 0

Application of J Integral for the Fracture Assessment of Welded Polymeric Components J积分在焊接聚合物构件断裂评定中的应用

Fracture Mechanics Applications Pub Date : 2019-11-27 DOI: 10.5772/INTECHOPEN.90188

Z. Major, Daniel Kimpfbeck, M. Miron

{"title":"Application of J Integral for the Fracture Assessment of Welded Polymeric Components","authors":"Z. Major, Daniel Kimpfbeck, M. Miron","doi":"10.5772/INTECHOPEN.90188","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.90188","url":null,"abstract":"For many demanding applications of engineering plastics, fracture behaviour under various loading conditions is of prime practical importance. It is well known that fracture properties of plastics are significantly affected by the loading rate, temperature and both local and global stress states. The limitations associated with conventional fracture test methods may, at least in principle, be overcome by the use of appropriate fracture mechanical approaches, which properly account for the temperature and rate dependence of the mechanical behaviour of plastics and should provide geometry-independent fracture toughness values. To provide an additional contribu-tion to this application, fracture tests were performed on both 15- and 20-mm-thick bulk-extruded sheets of a polypropylene random copolymer (PP(RC)) and on four different configurations of their welded joints. The fully ductile fracture range was determined by rate-dependent tests on single CT specimens, and fracture toughness values were derived at the peak loads ( J Fmax and CTOD Fmax ). Fracture toughness values were determined for stable crack extension based on the J- Δ a and/or CTOD- Δ a R -curves using single and multiple specimens in terms of various definitions of the crack initiation ( J 0.2 , J 0.2BL or δ 0.2 ) toughness values. As expected, both methods revealed distinct differences between the bulk materials and the welded joints. These differences were found to depend on the loading rate, the weld configuration and on the data reduction method ( J integral or CTOD ).","PeriodicalId":102571,"journal":{"name":"Fracture Mechanics Applications","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121773521","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

The Fracture Behavior of Pure and Hybrid Intraply Knitted Fabric-Reinforced Polymer Composites 纯和混杂针织物增强聚合物复合材料的断裂行为

Fracture Mechanics Applications Pub Date : 2019-10-04 DOI: 10.5772/intechopen.89478

H. E. Balcioglu, H. B. Ozmen

{"title":"The Fracture Behavior of Pure and Hybrid Intraply Knitted Fabric-Reinforced Polymer Composites","authors":"H. E. Balcioglu, H. B. Ozmen","doi":"10.5772/intechopen.89478","DOIUrl":"https://doi.org/10.5772/intechopen.89478","url":null,"abstract":"Due to the high synergistic effects of the components, hybrid composite materials are more advantageous than nonhybrid composite materials for advanced engineering applications. Additionally, knitted fabrics may have a different behavior than woven ones. Although the nonhybrid composites have only one reinforcing fiber type, the hybrid composites have multiple reinforcing fibers. In this chapter, fracture charac-terizations of laminated composites reinforced with intraply pure and hybrid knitted fabrics are experimentally and numerically investigated under different loading conditions. For this purpose, pure (100%) and hybrid fabrics (50 – 50%), which have 1 (cid:1) 1 rib-knitted structure, were knitted by using glass and carbon fibers. Also, hybrid fabrics were knitted in three different widths in order to investigate the effect of knitting pattern width on the fracture toughness. Fracture toughness and energy strain release rates of pure and hybrid Arcan test specimens were determined under mode I (0 o ), mixed-mode I/II (30 o , 45 o , and 60 o ), and mode II (90 o ) loading conditions. Also, the J-integral method was used to determine the fracture toughness. Experimental and numerical results were found to be consistent. When the results obtained from pure and hybrid fabrics are compared, it is seen that hybridization had positive effects on the fracture strength of composite material compared to pure glass/epoxy material. Additionally, as the width of the pattern decreased, the fracture strength of the hybrid composites increased. In this respect, the hybridization processing should be done in the narrowest pattern width for higher resistance to fracture.","PeriodicalId":102571,"journal":{"name":"Fracture Mechanics Applications","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128890809","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

The Effect of Geometrical Factors on the Surface Pressure Distribution on a Human Phantom Model Following Shock Exposure: A Computational and Experimental Study 冲击后几何因素对人体幻影模型表面压力分布的影响:计算与实验研究

Fracture Mechanics Applications Pub Date : 2019-08-26 DOI: 10.5772/INTECHOPEN.88809

M. Skotak, Molly T. Townsend, E. Alay, N. Chandra

引用次数: 4

Blast Effects on Structural Elements 爆炸对结构构件的影响

Fracture Mechanics Applications Pub Date : 2019-08-13 DOI: 10.5772/intechopen.88721

M. Chiquito, Anastasio P. Santos, L. M. López, R. Castedo

引用次数: 0

Construction of an Artificial Neural Network-Based Method to Detect Structural Damage 基于人工神经网络的结构损伤检测方法的构建

Fracture Mechanics Applications Pub Date : 2019-08-08 DOI: 10.5772/INTECHOPEN.87193

Francisco Casanova-del-Angel, Daniel Hernández-Galicia, Xochicale-Rojas Hugo Alberto

{"title":"Construction of an Artificial Neural Network-Based Method to Detect Structural Damage","authors":"Francisco Casanova-del-Angel, Daniel Hernández-Galicia, Xochicale-Rojas Hugo Alberto","doi":"10.5772/INTECHOPEN.87193","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.87193","url":null,"abstract":"This chapter shows the framework used to obtain data with which the artificial neural network (ANN) was developed. It describes its geometry, properties of the material, sections of structural elements, and loads used. Then, the numerical model of the framework under study is developed in structural analysis using SAP2000 ® software in order to obtain its modal parameters. In addition, a program made in MATLAB ® is shown, from which data with and without damage to the framework under study were obtained, and with which the ANN was developed. Data from the numerical model were used to corroborate data obtained with MATLAB ® . The neural model used in this work to detect structural damage is described. Data on damage were obtained simulating a plastic hinge in various elements of a test framework, varying the position of the hinge. The above resulted in obtaining various damage conditions for the same framework, which data thus obtained were used to develop the network. Damage conditions were hierarchized based on their fundamental periods in order to know where is more damage, depending on location of the hinge within the framework. Upon completion of the research, we have concluded that the methodology implemented to detect structural damage is rather simple. It was carried out in four steps.","PeriodicalId":102571,"journal":{"name":"Fracture Mechanics Applications","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121745323","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0