Material Design & Processing Communications最新文献

{"title":"Shot-peened fretting fatigue components: Endurance strength and fatigue life assessment","authors":"Andrea Zanichelli,&nbsp;Sabrina Vantadori","doi":"10.1002/mdp2.196","DOIUrl":"10.1002/mdp2.196","url":null,"abstract":"<p>It is well known that fretting fatigue promotes crack initiation and propagation in structural components, thus causing the failure of mechanical systems. Nowadays, many palliatives such as shot peening are used in order to prevent such ruptures. Nevertheless, when such treatments are applied, the fatigue assessment of the component becomes more complex. In the present paper, a methodology implementing the critical plane-based criterion by Carpinteri et al. for fretting fatigue is employed in order to estimate both endurance strength and fatigue life of Al 7075-T651 alloy shot-peened specimens subject to partial slip fretting fatigue loading.</p>","PeriodicalId":100886,"journal":{"name":"Material Design & Processing Communications","volume":"3 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/mdp2.196","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"106855552","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The impact of mesh structural design on nonlinear numerical simulation of geo-structure: A seismic analysis","authors":"Abdoullah Namdar","doi":"10.1002/mdp2.195","DOIUrl":"10.1002/mdp2.195","url":null,"abstract":"<p>The strain energy is one of the significant factors in geo-structure nonlinear analysis. The design quality in geotechnical earthquake engineering associates with the accuracy of the numerical simulation and the high quality of the seismic response prediction. In this study, the embankment-subsoil Models A and B are modeled with the same geometry and two different meshes. To predict the strain mechanism of the embankment-subsoil model, the hexahedral and tetrahedral meshes are used in nonlinear numerical simulation. To control the quality of the numerical simulation, the statistical analysis was made. The results of the statistical analysis illustrate that mesh shape governs the accuracy of the numerical simulation. The finding of this study improves the simulation of strain mechanism in embankment-subsoil seismic analysis.</p>","PeriodicalId":100886,"journal":{"name":"Material Design & Processing Communications","volume":"3 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/mdp2.195","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"112410444","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Qualification of the hybrid metal extrusion & bonding (HYB) process for welding of aluminium offshore structures","authors":"Lise Sandnes,&nbsp;Gisle Rørvik,&nbsp;Inge Morten Kulbotten,&nbsp;Øystein Grong,&nbsp;Filippo Berto","doi":"10.1002/mdp2.194","DOIUrl":"10.1002/mdp2.194","url":null,"abstract":"<p>In the present investigation the aptness of the HYB process for butt welding of 4mm AA6082-T6 profiles is evaluated and benchmarked against one gas metal arc (GMA) weld and one friction stir (FS) weld, representing best practice for both methods. The tensile testing shows that the yield strength of the HYB weld exceeds that of the GMA weld and is comparable with that of the FS weld. When it comes to impact toughness the HYB weld is the superior one of the three. Since the subsequent transverse bend testing did not reveal any evidence of bonding defects or crack formation, it means that the 4mm AA6082-T6 HYB butt weld meets all acceptance criteria being specified by Equinor for offshore use.</p>","PeriodicalId":100886,"journal":{"name":"Material Design & Processing Communications","volume":"3 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/mdp2.194","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"94048940","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"High-rate characterization of additively manufactured Ti-6Al-4V using Taylor cylinder impact test: Experiments","authors":"Gianluca Iannitti,&nbsp;Nicola Bonora,&nbsp;Gabriel Testa,&nbsp;Andrew Ruggiero","doi":"10.1002/mdp2.192","DOIUrl":"10.1002/mdp2.192","url":null,"abstract":"<p>Fracture behavior of additively manufactured (AM) Ti-6Al-4V has been investigated under quasistatic and impact loading. Taylor cylinder impact tests, on material printed along different directions, have been performed at various velocity to determine high-rate material deformation and impact velocity for damage initiation. Test results revealed that, although the AM material under quasistatic loading condition shows better characteristics than the corresponding wrought material grade, under impact condition, fracture in AM material occurred at an impact velocity almost half of that of wrought grade and at a strain 10 time less of the quasistatic uniaxial fracture strain. Microscopy investigation seems to indicate that pre-existing microvoids produced by the AM process promote shear band development under impact loading causing fracture at much lower strain.</p>","PeriodicalId":100886,"journal":{"name":"Material Design & Processing Communications","volume":"3 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/mdp2.192","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"97945341","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Monitoring of aeronautical composites with embedded FOBG sensor: Part I—Manufacturing and strain response under incremental fatigue loading spectrum","authors":"Tryfon Karagiannis,&nbsp;Evangelos F. Karachalios,&nbsp;Nikolaos D. Alexopoulos","doi":"10.1002/mdp2.191","DOIUrl":"10.1002/mdp2.191","url":null,"abstract":"<p>Carbon fiber-reinforced plastics were manufactured with embedded fiber optic Bragg grating (FOBG) sensors for strain monitoring purposes. A novel manufacturing concept was applied to decrease the possibility to induce damage on the ingress/egress point of the fiber to the laminate structure. Specimens without embedded sensors were manufactured as well, and quasi-static mechanical tests showed that FOBG embedding did not decrease the tensile mechanical properties. Coupons with embedded fiber were tested under different loading spectrum (ranging from 20% and up to 60% of ultimate tensile strength), and the differences between the loadings of the surface-attached strain gauge and the embedded sensor were less than 2.0% and for all the applied peak loads. Application of 65,000 fatigue cycles on several coupons was assessed to simulate the fatigue loading of the coupons over their life span. The already fatigued coupons were tested at the same loading spectrum, and their strain measurements were compared against the respective loading spectrum without prior fatigue. The differences at peak loads were less than 1.0%, and therefore, it can be assumed that fatigue damage after65,000 cycles was not accumulated in the sensing area of the Bragg grating sensor. To this end, the investigated FOBG embedding procedure and the proposed manufacturing methodology do not impose damage on the laminate composite.</p>","PeriodicalId":100886,"journal":{"name":"Material Design & Processing Communications","volume":"3 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/mdp2.191","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85280000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Multiaxial fatigue behavior of additively manufactured Ti6Al4V alloy: Axial–torsional proportional loads","authors":"Danilo A. Renzo,&nbsp;Emanuele Sgambitterra,&nbsp;Pietro Magarò,&nbsp;Franco Furgiuele,&nbsp;Carmine Maletta,&nbsp;Carlo Alberto Biffi,&nbsp;Jacopo Fiocchi,&nbsp;Ausonio Tuissi","doi":"10.1002/mdp2.190","DOIUrl":"10.1002/mdp2.190","url":null,"abstract":"<p>Additive manufacturing (AM) techniques are under constant development and selective laser melting (SLM) is among the most promising ones. However, widespread use of AM techniques in many industries is limited by the different/unusual mechanical properties of AM metallic parts, with respect to traditionally processed ones, especially when dealing with complex fatigue loading conditions. In fact, crack formation and propagation mechanisms are mainly affected by the development of internal defects, residual stresses, and microstructural changes. This is actually one of the major issues the materials engineering community is facing today. In many applications, AM components are subjected to multiaxial fatigue loads, arising from operating conditions and/or from complex geometries, that unavoidably generate crack initiation and propagation mechanisms. The aim of this study is to investigate the multiaxial fatigue behavior of additively manufactured Ti6Al4V samples, made by SLM. Fatigue tests, combining proportional axial and torsional loads, were performed on thin-walled tubular specimens. Full-field measurement techniques, such as the infrared thermography and digital image correlation, were also used to capture temperature and strain evolutions, at both local scales and global scales. Fatigue results highlighted damage mechanisms, and failure modes are strongly related to the applied stress level.</p>","PeriodicalId":100886,"journal":{"name":"Material Design & Processing Communications","volume":"3 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/mdp2.190","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91511003","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Application of the Guggenheim, Anderson, de Boer equation to study the impact of sealing treatments on pine wood sorption characteristics","authors":"Chiara Bertolin,&nbsp;Lavinia de Ferri,&nbsp;Marcin Strojecki","doi":"10.1002/mdp2.189","DOIUrl":"10.1002/mdp2.189","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <p>Surface treatments can modify the materials behavior toward water sorption phenomena. The Guggenheim–Andersen–de Boer sorption equation, already used in the past to study various wood species, is here proposed to investigate the sorption behavior of pine wood samples treated with different sealing material. Particularly, the paper aims to explore the modification of the <i>k</i> parameter with the applied coating. Measurements of sorption–desorption branches permitted to clearly distinguish the behavior of treated samples, the relative humidity (RH) conditions over which they are more dimensionally stable, as well as their tendency to swell and shrink. The proposed study permitted to evaluate the usefulness of the <i>k</i> parameter as an indicator of the presence of chemical treatments on wood at high RH values. Particularly, the <i>k</i> value has been found to change as a function of chemicals surface treatments limiting in different ways the access and expulsion of water moisture.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Highlights</h3>\u0000 \u0000 <div>\u0000 \u0000 <ul>\u0000 \u0000 <li>Surface sealed pine wood samples were analyzed by vacuum microbalance.</li>\u0000 \u0000 <li>The Guggenheim–Andersen–de Boer equation has been applied to water sorption–desorption data.</li>\u0000 \u0000 <li>The equilibrium moisture content and its first derivative explained samples swelling/shrinking tendency.</li>\u0000 \u0000 <li>Assessment of the usefulness of <i>k</i> as indicator of the wood treatment at high relative humidity values.</li>\u0000 \u0000 <li>Assessment of <i>k</i> modifications in relation to the type of sealing treatment.</li>\u0000 </ul>\u0000 </div>\u0000 </section>\u0000 </div>","PeriodicalId":100886,"journal":{"name":"Material Design & Processing Communications","volume":"3 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/mdp2.189","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"112880951","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of synergism and multistep heating in graphene–polypyrrole–polymethyl methacrylate composites on their electrical and mechanical properties in additive manufacturing","authors":"Velram Balaji Mohan,&nbsp;Debes Bhattacharyya","doi":"10.1002/mdp2.182","DOIUrl":"10.1002/mdp2.182","url":null,"abstract":"<p>A highly electrically conductive hybrid multicomponent graphene–polymer composite was produced by solvent casting method with subsequent melt blending processes. As per the experimental design, the composite had to undergo multiple heating steps from solvent casting to extrusion to 3D-printing, the effects of processing conditions, mainly temperature, on its mechanical and electrical properties and the mechanisms behind the changes had to be understood. It has been noted that there is a significant increase in mechanical properties from extruded strand (tensile strength [48 MPa] and flexural strength [27 MPa]) to 3D-printed samples (tensile strength [67 MPa] and flexural strength [61 MPa]). An electrical conductivity of 11.4 S cm⁻¹ was measured for the as-synthesised composite before melt processing. However, the conductivity does not change noticeably until 3D-printing. From the thermogravimetric analysis, it is clear that there is no change in the functionalities of extruded strands and 3D-printed sample, but energy dispersive spectroscopy analysis showed that there is a significant reduction in agglomerates that played a critical factor in improving the homogeneity of the dispersion.</p>","PeriodicalId":100886,"journal":{"name":"Material Design & Processing Communications","volume":"2 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/mdp2.182","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"109032692","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Application of the origami shape in the development of automotive crash box","authors":"Mario Boreanaz,&nbsp;Giovanni Belingardi,&nbsp;Ciro De Faria Maia","doi":"10.1002/mdp2.181","DOIUrl":"10.1002/mdp2.181","url":null,"abstract":"<p>The application of the origami geometry is proposed to shape the vehicle front crash box. A numerical and experimental study is developed to design innovative efficient thin-walled tubes used as crash box in the automotive field with the scope of absorbing energy in the initial phase of an impact event. This geometry consists of a preformed surface pattern that, when submitted to an axial load, collapses in a controlled progressive deformation of the structure and induces a homogenous folding. The goal pursued in adopting this particular geometry is to increase the amount of the energy absorption while using less material. Therefore, in addition to improving the performance of the component, it contributes to save material, weight, and space.</p><p>The results reported in this paper confirm the potential of this origami geometry. The present study started with an extensive virtual analysis, followed by an experimental test campaign for confirmation. The virtual analysis initiated from a classic crash box, actually used on a car (that is our reference structure). Then an origami-shaped crash box has been developed with roughly the same dimensions. As a first step, a sensitivity analysis has been performed through the numerical study to identify the most effective design parameters. Finally, in order to obtain the experimental confirmation of the obtained results, an experimental crush test campaign on specimens with the same geometry studied numerically has been executed. Prototypes of the origami-shaped crash boxes were manufactured by steel sheet cold forming, cutting, and welding. Ten quasistatic axial crush tests were conducted in the FCA-LATAM laboratory in Belo Horizonte and correlation between the virtual and physical results assessed.</p>","PeriodicalId":100886,"journal":{"name":"Material Design & Processing Communications","volume":"2 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/mdp2.181","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134170181","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental investigation of the effects of infusing a foam into hydrogels on the hyperelastic coefficients","authors":"Hassan Mansour Raheem,&nbsp;Ahmed M. Al-Mukhtar","doi":"10.1002/mdp2.180","DOIUrl":"10.1002/mdp2.180","url":null,"abstract":"<p>Hydrogels are viscoelastic material, soft and fragile materials that contain high water percent. These properties cannot sustain high axial compression loads. In this study, a foam was infused into hydrogel, agarose, to enhance the mechanical properties of the hydrogel/foam composite. Besides, it is difficult to measure the mechanical properties of the hydrogel alone specifically in tension because of the slipping in the grip during using the common tensile test. Therefore; the goal of this study is to investigate the influences of infused cellulose foam into the prepared hydrogels on the mechanical properties of the hydrogels by conducting the unconfined compression on hydrogel/foam composite and the hydrogel alone. It is also to utilize the strain energy density functions (SEDFs) to determine a suitable constitutive model that represents the nonlinear behavior of the materials. It is to predict the behavior of these materials out of range of the test (i.e., in tension) by implementing a finite elements analysis (FEA) using ABAQUS. The results showed that the strength of the hydrogel/foam composite was significantly greater than hydrogel alone. All hyperelastic models have well defined the nonlinear behavior of the experimental data. FEA results in tension are in good agreement with those predicted using hyperelastic models.</p>","PeriodicalId":100886,"journal":{"name":"Material Design & Processing Communications","volume":"3 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/mdp2.180","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"92940582","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}