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A constitutive structural parameter cb for the work hardening behavior of additively manufactured Ti-6Al-4V 增材制造Ti-6Al-4V加工硬化性能的本构参数cb
Material Design & Processing Communications Pub Date : 2021-07-21 DOI: 10.1002/mdp2.262
Alan F. Jankowski
{"title":"A constitutive structural parameter cb for the work hardening behavior of additively manufactured Ti-6Al-4V","authors":"Alan F. Jankowski","doi":"10.1002/mdp2.262","DOIUrl":"10.1002/mdp2.262","url":null,"abstract":"<p>The mechanical behavior of Ti-6Al-4V produced by additive manufacturing processes is assessed as based on a model derived from the Kocks–Mecking relationship. A constitutive parameter c<sub>b</sub> is derived from a linear Kocks–Mecking relationship for the microstructure that is characteristic of the work hardening behavior. The formulation for c<sub>b</sub> is determined by considering the plastic strain between the strengths at the proportional limit and the plastic instability. In this way, the model accommodates the variation in work hardening behavior observed when evaluating material as produced and tested along different orientations. The modeling approach is presented and evaluated for the case of Ti-6Al-4V additively manufactured materials as tested under quasi-static uniaxial tension. It is found that different test specimen orientations, along with postbuild heat treatments, produce a change in the microstructure and plasticity behavior which can be accounted for in the corresponding change of the c<sub>b</sub> values.</p>","PeriodicalId":100886,"journal":{"name":"Material Design & Processing Communications","volume":"3 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/mdp2.262","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88801548","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}
引用次数: 1
On the significance of diffuse crack width self-evolution in the phase-field model for residually stressed brittle materials 论残余应力脆性材料相场模型中弥散裂纹宽度自演化的意义
Material Design & Processing Communications Pub Date : 2021-07-12 DOI: 10.1002/mdp2.261
Enrico Salvati, Francesco Menegatti, Manish Kumar, Marco Pelegatti, Alessandro Tognan
{"title":"On the significance of diffuse crack width self-evolution in the phase-field model for residually stressed brittle materials","authors":"Enrico Salvati,&nbsp;Francesco Menegatti,&nbsp;Manish Kumar,&nbsp;Marco Pelegatti,&nbsp;Alessandro Tognan","doi":"10.1002/mdp2.261","DOIUrl":"10.1002/mdp2.261","url":null,"abstract":"<p>The Phase-Field method is an attractive numerical technique to simulate fracture propagation in materials relying on Finite Element Method. Its peculiar diffuse representation of cracks makes it suitable for a myriad of problems, especially those involving multiple physics and complex-shaped crack patterns.</p><p>Recent literature provided linear relationships between the width of the diffuse crack and the material intrinsic fracture toughness, through a material characteristic length. However, lately, it was shown how the existence of a residual stress field can affect the represented crack width even for fully homogeneous materials, in terms of toughness.</p><p>In this short note, the authors tried to shed some light on the factors influencing the width of the diffuse crack representation. By simulating crack propagation in several residually stressed brittle materials, it was shown how the width of the diffuse crack is affected by the ratio between the driving force - due to the externally applied load - and the driving force required to propagate the crack. In other words, the diffuse crack extent can be linked to the degree of crack propagation stability/instability. Monitoring the evolution of the studied quantity can be of great interest to rapidly assess crack instability circumstances, under displacement control.</p>","PeriodicalId":100886,"journal":{"name":"Material Design & Processing Communications","volume":"3 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/mdp2.261","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79024747","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}
引用次数: 3
Effect of tool size on AA6061-T6 double-sided friction stir welds 刀具尺寸对AA6061-T6双面搅拌摩擦焊缝的影响
Material Design & Processing Communications Pub Date : 2021-07-06 DOI: 10.1002/mdp2.259
Ashu Garg, Anirban Bhattacharya
{"title":"Effect of tool size on AA6061-T6 double-sided friction stir welds","authors":"Ashu Garg,&nbsp;Anirban Bhattacharya","doi":"10.1002/mdp2.259","DOIUrl":"10.1002/mdp2.259","url":null,"abstract":"<p>The present work investigates the effects of tool size on microstructural evolution, tensile strength, and microhardness on double-sided friction stir welding of 12.7-mm-thick AA6061-T6 plates. Three different tools were designed having pin diameters equal to pin lengths of 6.25, 7.5, and 8.5 mm and corresponding shoulder diameters of 18.75, 22.5, and 24.5 mm, respectively. The welds obtained with these three tools were designated as Welds A, B, and C, respectively. Results showed the highest tensile and yield strength for Weld B. The tensile fracture appearance of Welds A and B indicated reasonable necking with crack initiation and propagation through heat affected zone on the advancing side of the weld. However, in the Weld C, fracture appeared in the stir zone near the confluence of thermo-mechanically affected zone. Electron back scatter diffraction indicates dominance of high angle grain boundaries and major shear textures <i>C</i> and \u0000 components which corresponds to {001}&lt;110&gt;, \u0000&lt;110&gt;, and \u0000&lt;\u0000&gt; textures in the weld nugget.</p>","PeriodicalId":100886,"journal":{"name":"Material Design & Processing Communications","volume":"3 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/mdp2.259","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84238660","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}
引用次数: 3
Charpy impact properties and numerical modeling of polycarbonate composites 聚碳酸酯复合材料的夏比冲击性能及数值模拟
Material Design & Processing Communications Pub Date : 2021-07-02 DOI: 10.1002/mdp2.260
Tamas Krausz, Iulian-Ionut Ailinei, Sergiu Valentin Galatanu, Liviu Marsavina
{"title":"Charpy impact properties and numerical modeling of polycarbonate composites","authors":"Tamas Krausz,&nbsp;Iulian-Ionut Ailinei,&nbsp;Sergiu Valentin Galatanu,&nbsp;Liviu Marsavina","doi":"10.1002/mdp2.260","DOIUrl":"10.1002/mdp2.260","url":null,"abstract":"<p>Polycarbonate composites are widely spread in many industries, for product manufacturing. Although these materials are being used with high fidelity, their mechanical properties will highly depend on manufacturing processes, fiber orientations with respect to external loads, type of loading, environmental conditions, and so forth. This paper presents the Charpy impact behavior of three polycarbonate grades, in notched and unnotched conditions, as follows: <i>Makrolon 2405</i>—unreinforced polycarbonate, <i>Makrolon 9415</i>—polycarbonate with 10% glass fiber, and <i>Makrolon 8035</i>—polycarbonate with 30% glass fiber. The experimental measurements clearly demonstrated the effect of the fiber content on the impact strength of the material: as the fiber ratio increases, the impact strength decreases, exhibiting brittle behavior. The impact characterization of the notched specimens can facilitate the material selection for applications with higher geometrical complexities, where stress concentrators cannot be eliminated. In addition, the material models obtained through correlations could help increase simulation accuracy and speed up product development cycles.</p>","PeriodicalId":100886,"journal":{"name":"Material Design & Processing Communications","volume":"3 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/mdp2.260","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74496593","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}
引用次数: 9
On the effect of the node and building orientation on the fatigue behavior of L-PBF Ti6Al4V lattice structure sub-unital elements 节点和构建方向对L-PBF Ti6Al4V晶格结构亚单元元件疲劳行为的影响
Material Design & Processing Communications Pub Date : 2021-06-30 DOI: 10.1002/mdp2.258
Simone Murchio, Michele Dallago, Andrea Rigatti, Valerio Luchin, Filippo. Berto, Devid Maniglio, Matteo Benedetti
{"title":"On the effect of the node and building orientation on the fatigue behavior of L-PBF Ti6Al4V lattice structure sub-unital elements","authors":"Simone Murchio,&nbsp;Michele Dallago,&nbsp;Andrea Rigatti,&nbsp;Valerio Luchin,&nbsp;Filippo. Berto,&nbsp;Devid Maniglio,&nbsp;Matteo Benedetti","doi":"10.1002/mdp2.258","DOIUrl":"10.1002/mdp2.258","url":null,"abstract":"<p>Despite the great potential of additively manufactured (AM) metallic lattice materials, a comprehensive understanding of their mechanical behavior, particularly fatigue, has yet to be achieved. The role of the sub-unital lattice elements, that is, the struts and the nodes (or strut junctions), is rarely explored, even though it is well known that fatigue is a local phenomenon, determined by the small features of a structure (defects and local geometrical discontinuities).</p><p>In this work, the mechanical behavior of nodes and struts has been investigated by designing laser powder bed fusion (L-PBF) Ti6Al4V single strut specimens, with a node placed in the central part of the gauge length. The specimens were manufactured according to four different building orientations, namely, 90°, 45°, 15°, and 0° to the build plane. The influence of the fillet radius at the node and of the printing direction on the fatigue strength has been examined.</p>","PeriodicalId":100886,"journal":{"name":"Material Design & Processing Communications","volume":"3 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mdp2.258","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87000727","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}
引用次数: 6
Correlation between as-designed and as-built Young's modulus of cubic regular, cubic irregular, and trabecular cellular materials 设计和建造的立方规则、立方不规则和小梁细胞材料的杨氏模量之间的关系
Material Design & Processing Communications Pub Date : 2021-06-22 DOI: 10.1002/mdp2.257
Sunil Raghavendra, Alberto Molinari, Gianluca Zappini, Matteo Benedetti
{"title":"Correlation between as-designed and as-built Young's modulus of cubic regular, cubic irregular, and trabecular cellular materials","authors":"Sunil Raghavendra,&nbsp;Alberto Molinari,&nbsp;Gianluca Zappini,&nbsp;Matteo Benedetti","doi":"10.1002/mdp2.257","DOIUrl":"10.1002/mdp2.257","url":null,"abstract":"<p>Laser powder bed fusion process is widely used in producing cellular materials for various applications. However, there are limitations in the process to produce high-porosity cellular materials with accuracy. A deviation is observed between the as-built and the as-designed geometrical parameters that lead to variation in the obtained stiffness of the cellular material. This study investigates the behavior of three cell topologies, cubic regular, cubic irregular, and trabecular under as-designed and as-built configurations to study their Young's modulus variation. The obtained results are compared with the ideal predictions of the Gibson–Ashby law to evaluate the deviation. Eventually, a linear correlation was developed between the as-designed and as-built Young's modulus to generate a database to select the as-designed geometry/properties to obtain the required as-built geometry/properties.</p>","PeriodicalId":100886,"journal":{"name":"Material Design & Processing Communications","volume":"3 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/mdp2.257","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89629808","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}
引用次数: 0
Printing and characterization of three-dimensional high-loaded nanocomposites structures 三维高载荷纳米复合材料结构的打印与表征
Material Design & Processing Communications Pub Date : 2021-06-05 DOI: 10.1002/mdp2.256
Corrado Sciancalepore, Federica Bondioli, Massimo Messori, Daniel Milanese
{"title":"Printing and characterization of three-dimensional high-loaded nanocomposites structures","authors":"Corrado Sciancalepore,&nbsp;Federica Bondioli,&nbsp;Massimo Messori,&nbsp;Daniel Milanese","doi":"10.1002/mdp2.256","DOIUrl":"10.1002/mdp2.256","url":null,"abstract":"<p>This study demonstrates the feasibility of fabricating by additive manufacturing composite objects based on acrylic hybrid photocurable formulations, containing 45% by weight of silica nanoparticles, with an average size of about 30 nm. A commercial stereolithography apparatus was used to selectively cure, layer by layer, the high-loaded acrylic resin. The presence of the filler determines an increase in the physical and mechanical properties of the samples that become significantly stiffer and stronger than the pristine matrix. Dynamic mechanical analysis performed on the printed samples gave promising results for the use of developed formulation in the realization of three-dimensional (3D) polymeric structures with improved mechanical properties.</p>","PeriodicalId":100886,"journal":{"name":"Material Design & Processing Communications","volume":"3 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/mdp2.256","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77335040","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}
引用次数: 2
Energy release as a parameter for fatigue design of additive manufactured metals 能量释放作为增材制造金属疲劳设计的参数
Material Design & Processing Communications Pub Date : 2021-05-29 DOI: 10.1002/mdp2.255
Dario Santonocito, Andrea Gatto, Giacomo Risitano
{"title":"Energy release as a parameter for fatigue design of additive manufactured metals","authors":"Dario Santonocito,&nbsp;Andrea Gatto,&nbsp;Giacomo Risitano","doi":"10.1002/mdp2.255","DOIUrl":"10.1002/mdp2.255","url":null,"abstract":"<p>Additive manufacturing (AM) is spreading in a wide range of industrial fields. The influence of the printing parameters on the mechanical performance is still an open issue among researchers, particularly when dealing with fatigue loads, which can lead to an unexpected failure. Classical fatigue tests require a large amount of time and materials to be consumed. Compared to the traditional fatigue assessment, the thermographic method (TM) is able to derive in a very rapid way the SN curve and fatigue limit of the material monitoring its energetic release during fatigue tests.</p><p>In this work, for the first time, the energetic release during fatigue test has been evaluated in specimens made of AISI 316L, obtained by SLM technique. Compared to literature data, the specimens show premature failure, even at low stress levels, with brittle fracture surfaces. The internal microstructure seems to be strictly related to the energetic release of the material.</p>","PeriodicalId":100886,"journal":{"name":"Material Design & Processing Communications","volume":"3 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/mdp2.255","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73411650","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}
引用次数: 8
Bending behavior of 3D printed sandwich beams with different core topologies 不同芯材拓扑结构的3D打印夹层梁的弯曲性能
Material Design & Processing Communications Pub Date : 2021-05-28 DOI: 10.1002/mdp2.252
Andrei Ioan Indreș, Dan Mihai Constantinescu, Oana Alexandra Mocian
{"title":"Bending behavior of 3D printed sandwich beams with different core topologies","authors":"Andrei Ioan Indreș,&nbsp;Dan Mihai Constantinescu,&nbsp;Oana Alexandra Mocian","doi":"10.1002/mdp2.252","DOIUrl":"10.1002/mdp2.252","url":null,"abstract":"<p>Lightweight core topologies have been considered as an advanced alternative to improve the overall performance of sandwich structures in bending. Designed sandwich beams containing 3D printed cores as conventional honeycomb, re-entrant auxetic honeycomb with two positions of the cells, and chiral topologies were created with CATIA V5. The sandwich beams were manufactured from polylactic acid polymer (PLA) by fused deposition modeling (FDM) using the Ultimaker 3 Extended printer. Three-point bending testing was conducted on sandwich beams using an Instron 8872 testing machine and following ASTM C393-20, as to obtain the strength, bending stiffness, and energy absorption of the sandwich beams for these three designed core topologies. Comments on the cores' performance and sandwich beams response are done together with observations concerning their failure.</p>","PeriodicalId":100886,"journal":{"name":"Material Design & Processing Communications","volume":"3 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/mdp2.252","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"93118810","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}
引用次数: 9
Fracture toughness in additive manufacturing by selective laser sintering: an overview 选择性激光烧结增材制造中的断裂韧性研究综述
Material Design & Processing Communications Pub Date : 2021-05-27 DOI: 10.1002/mdp2.254
Liviu Marșavina, Dan Ioan Stoia, Linul Emanoil
{"title":"Fracture toughness in additive manufacturing by selective laser sintering: an overview","authors":"Liviu Marșavina,&nbsp;Dan Ioan Stoia,&nbsp;Linul Emanoil","doi":"10.1002/mdp2.254","DOIUrl":"10.1002/mdp2.254","url":null,"abstract":"<p>This paper presents manufacturing, testing, and computing steps for determining the fracture toughness property of polyamide PA 2200 processed by laser sintering using different process parameters. The design of the samples was conducted according to ASTM D5045-99 and ASTM D5528-01, and the fracture tests consist of four-point bending in symmetric and asymmetric configuration and double cantilever beam test. The process parameters selected as variables were in-plane orientation, spatial orientation, energy density of the process, and induced structural defects. The results provide an extended view regarding the variation of fracture properties when the manufacturing conditions in laser sintering are changed.</p>","PeriodicalId":100886,"journal":{"name":"Material Design & Processing Communications","volume":"3 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/mdp2.254","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78117963","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}
引用次数: 4
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