Journal of Applied Mechanics-Transactions of the Asme最新文献

Improved Ballistic Impact Resistance of Nanofibrillar Cellulose Films with Discontinuous Fibrous Bouligand Architecture. 具有不连续纤维Bouligand结构的纳米纤维纤维素膜抗弹道冲击性能的改进

IF 2.6 4区工程技术

Journal of Applied Mechanics-Transactions of the Asme Pub Date : 2024-02-01 Epub Date: 2023-10-16 DOI: 10.1115/1.4063271

Colby Caviness, Yitong Chen, Zhangke Yang, Haoyu Wang, Yongren Wu, Zhaoxu Meng

{"title":"Improved Ballistic Impact Resistance of Nanofibrillar Cellulose Films with Discontinuous Fibrous Bouligand Architecture.","authors":"Colby Caviness, Yitong Chen, Zhangke Yang, Haoyu Wang, Yongren Wu, Zhaoxu Meng","doi":"10.1115/1.4063271","DOIUrl":"10.1115/1.4063271","url":null,"abstract":"<p><p>Natural protective materials offer unparalleled solutions for impact-resistant material designs that are simultaneously lightweight, strong, and tough. Particularly, the Bouligand structure found in the dactyl club of mantis shrimp and the staggered structure in nacre achieve excellent mechanical strength, toughness, and impact resistance. Previous studies have shown that hybrid designs by combining different bioinspired microstructures can lead to enhanced mechanical strength and energy dissipation. Nevertheless, it remains unknown whether combining Bouligand and staggered structures in nanofibrillar cellulose (NFC) films, forming a discontinuous fibrous Bouligand (DFB) architecture, can achieve enhanced impact resistance against projectile penetration. Additionally, the failure mechanisms under such dynamic loading conditions have been minimally understood. In our study, we systematically investigate the dynamic failure mechanisms and quantify the impact resistance of NFC thin films with DFB architecture by leveraging previously developed coarse-grained models and ballistic impact molecular dynamics simulations. We find that when nanofibrils achieve a critical length and form DFB architecture, the impact resistance of NFC films outperforms the counterpart films with continuous fibrils by comparing their specific ballistic limit velocities and penetration energies. We also find that the underlying mechanisms contributing to this improvement include enhanced fibril sliding, intralayer and interlayer crack bridging, and crack twisting in the thickness direction enabled by the DFB architecture. Our results show that by combining Bouligand and staggered structures in NFC films, their potential for protective applications can be further improved. Our findings can provide practical guidelines for the design of protective films made of nanofibrils.</p>","PeriodicalId":54880,"journal":{"name":"Journal of Applied Mechanics-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10913807/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46166235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

FAST OPTIMAL DESIGN OF SHELL-GRADED-INFILL STRUCTURES WITH EXPLICIT BOUNDARY BY A HYBRID MMC-AABH PLUS APPROACH 基于混合mmc-aabh +方法的显边界壳级配填充结构快速优化设计

4区工程技术

Journal of Applied Mechanics-Transactions of the Asme Pub Date : 2023-11-08 DOI: 10.1115/1.4064035

Yikang Bi, Shaoshuai Li, Yichao Zhu

{"title":"FAST OPTIMAL DESIGN OF SHELL-GRADED-INFILL STRUCTURES WITH EXPLICIT BOUNDARY BY A HYBRID MMC-AABH PLUS APPROACH","authors":"Yikang Bi, Shaoshuai Li, Yichao Zhu","doi":"10.1115/1.4064035","DOIUrl":"https://doi.org/10.1115/1.4064035","url":null,"abstract":"Abstract In this study, a hybrid MMC-AABH plus approach is developed for the fast optimal design of shell-graded-infill structures. The key idea is to use a proper description about the graded microstructural infill and the coating shell. To this end, a set of moving morphable components is adopted to represent the boundary of the coating shell, while the graded infill is embodied by spatially varying orthotropic porous configurations. Under such a treatment, with a small number of design variables, both the boundary of the coating shell and the graded microstructure infill can be optimized simultaneously. Other attractive features of the present study are summarized as follows. Firstly, the smooth variation across the microstructural infill can be automatically satisfied based on the proposed approach compared with other similar method. Secondly, with the use of the extreme value principle of Laplace equation, the minimum feature size can be explicit controlled during the optimization. Thirdly, compared with other methods in the frontier, the approach proposed in the present study enjoys considerable reduction in the computation cost and can obtain near-optimal design of coating structure. The effectiveness of the proposed approach is further demonstrated with numerical examples.","PeriodicalId":54880,"journal":{"name":"Journal of Applied Mechanics-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135390865","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Head Injuries Induced by Tennis Ball Impacts: A Computational Study 网球撞击致头部损伤的计算研究

4区工程技术

Journal of Applied Mechanics-Transactions of the Asme Pub Date : 2023-11-03 DOI: 10.1115/1.4063814

Yongqiang Li, Xin-Lin Gao

{"title":"Head Injuries Induced by Tennis Ball Impacts: A Computational Study","authors":"Yongqiang Li, Xin-Lin Gao","doi":"10.1115/1.4063814","DOIUrl":"https://doi.org/10.1115/1.4063814","url":null,"abstract":"Abstract Head injuries induced by tennis ball impacts are computationally studied. The impact of a two-piece tennis ball on a human head is simulated by using an established full body model and a newly constructed tennis ball model. The new tennis ball model is validated against existing experimental data. The frontal impact of a tennis ball on a human head at a velocity of 25 m/s is first studied as the baseline case. The effects of the impact location, velocity, and angle as well as the ball spinning are then examined. It is revealed that the lateral impact results in a higher risk of head injury than the frontal and crown impacts. In addition, it is found that the impact force and von Mises stress in the skull, the intracranial pressure and first principal strain in the brain, and the translational and rotational accelerations at the center of gravity of the head all increase with the increase of the impact velocity. Moreover, the normal (90-deg) impact has the highest risk of head injury, which is followed by the 60-deg, 45-deg and 30-deg impacts. Further, it is observed that the spinning of the tennis ball has insignificant effects on the head response. The simulation results show that there will be no skull fracture or mild brain injury in the baseline case. However, traumatic brain injuries may occur after the impact velocity exceeds 40 m/s. The findings of the current study provide new insights into the risks of head injuries induced by tennis ball impacts.","PeriodicalId":54880,"journal":{"name":"Journal of Applied Mechanics-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135775138","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The role of frequency and impedance contrasts in bandgap closing and formation patterns of axially-vibrating phononic crystals 频率和阻抗在轴振声子晶体带隙闭合和形成模式中的作用

4区工程技术

Journal of Applied Mechanics-Transactions of the Asme Pub Date : 2023-11-03 DOI: 10.1115/1.4063815

Hasan B. Al Ba'ba'a, Mostafa Nouh

{"title":"The role of frequency and impedance contrasts in bandgap closing and formation patterns of axially-vibrating phononic crystals","authors":"Hasan B. Al Ba'ba'a, Mostafa Nouh","doi":"10.1115/1.4063815","DOIUrl":"https://doi.org/10.1115/1.4063815","url":null,"abstract":"Abstract Bandgaps, or frequency ranges of forbidden wave propagation, are a hallmark of phononic crystals (PnCs). Unlike their lattice counterparts, PnCs taking the form of continuous structures exhibit an infinite number of bandgaps of varying location, bandwidth, and distribution along the frequency spectrum. While these bandgaps are commonly predicted from benchmark tools such as the Bloch-wave theory, the conditions that dictate the patterns associated with bandgap symmetry, attenuation, or even closing in multi-bandgap PnCs remain an enigma. In this work, we establish these patterns in one-dimensional rods undergoing longitudinal motion via a canonical transfer-matrix-based approach. In doing so, we connect the conditions governing bandgap formation and closing to their physical origins in the context of the Bragg condition (for infinite media) and natural resonances (for finite counterparts). The developed framework uniquely characterizes individual bandgaps within a larger dispersion spectrum regardless of their parity (i.e., odd versus even bandgaps) or location (low versus high-frequency), by exploiting dimensionless constants of the PnC unit cell which quantify the different contrasts between its constitutive layers. These developments are detailed for a bi-layered PnC and then generalized for a PnC of any number of layers by increasing the model complexity. We envision this mathematical development to be a future standard for the realization of hierarchically structured PnCs with prescribed and finely tailored bandgap profiles.","PeriodicalId":54880,"journal":{"name":"Journal of Applied Mechanics-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135775137","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental Validation of Reconstructed Microstructure via Deep Learning in Discontinuous Fiber Platelet Composite 基于深度学习的不连续纤维血小板复合材料微观结构重构实验验证

4区工程技术

Journal of Applied Mechanics-Transactions of the Asme Pub Date : 2023-11-02 DOI: 10.1115/1.4063983

Mohammad Nazmus Saquib, Richard Larson, Siavash Sattar, Jiang Li, Sergey Kravchenko, Oleksandr Kravchenko

引用次数: 0

A Non-contact Method for Estimating Thin Metal Film Adhesion Strength through Current Induced Void Growth 通过电流诱导空隙生长估算金属薄膜粘附强度的非接触方法

4区工程技术

Journal of Applied Mechanics-Transactions of the Asme Pub Date : 2023-11-01 DOI: 10.1115/1.4063948

Sudarshan Prasad, Pavan Kumar Vaitheeswaran, Yuvraj Singh, Pei-En Chou, Huanyu Liao, Ganesh Subbarayan

{"title":"A Non-contact Method for Estimating Thin Metal Film Adhesion Strength through Current Induced Void Growth","authors":"Sudarshan Prasad, Pavan Kumar Vaitheeswaran, Yuvraj Singh, Pei-En Chou, Huanyu Liao, Ganesh Subbarayan","doi":"10.1115/1.4063948","DOIUrl":"https://doi.org/10.1115/1.4063948","url":null,"abstract":"Abstract Studies have reported that the electromigration induced void growth velocity in metal thin films is inversely related to the adhesion strength of the metal thin film with the base and passivation layers. It was also observed that the contribution of interface adhesion strength to electromigration resistance decreases with increase in temperature. In this study an expression is derived for the diffusive void growth velocity induced by electromigration from a generalized thermodynamically consistent continuum-based theory for reaction-diffusion driven solid state interface evolution. This relation captures the effect of adhesion with the base and passivation layers on electromigration resistance of thin metal films. Electromigration experiments were carried out at elevated temperatures and high current density to induce voiding in thin Cu metal film deposited on a base layer of TiN and passivated with TiN or SiNx. The degradation of interface adhesion strength with temperature is modeled using an Andrade-type of relationship. The void growth rates characterized in these experiments are combined with the expression for void growth rate to estimate the interface adhesion strength for the Cu-TiN and Cu-SiNx interfaces. The methodology for estimating the adhesion strength of the metal-passivation layer interface is validated through comparison with interface adhesion strengths from mechanical de-adhesion tests reported in literature.","PeriodicalId":54880,"journal":{"name":"Journal of Applied Mechanics-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135320579","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A mechano-electro-chemical coupling model for bending analysis of single-stranded DNA-microbeam biosensors due to flexoelectricity 单链dna -微束生物传感器挠性分析的机电耦合模型

4区工程技术

Journal of Applied Mechanics-Transactions of the Asme Pub Date : 2023-11-01 DOI: 10.1115/1.4063949

Zouqing Tan, Yang Feng, Xiaohao Shi, Yanmei Yue, Neng-Hui Zhang

{"title":"A mechano-electro-chemical coupling model for bending analysis of single-stranded DNA-microbeam biosensors due to flexoelectricity","authors":"Zouqing Tan, Yang Feng, Xiaohao Shi, Yanmei Yue, Neng-Hui Zhang","doi":"10.1115/1.4063949","DOIUrl":"https://doi.org/10.1115/1.4063949","url":null,"abstract":"Abstract Highly compliant structures such as microbeams can deform substantially in response to interactions between molecules adsorbed on their surface. To understand such systems and improve their detection signals, a mechano-electro-chemical coupling model for mechanical deformations of the microbeams immobilized single stranded DNA (ssDNA) is established due to flexoelectricity. The governing equations and corresponding boundary conditions of ssDNA-microbeams are derived by using the variational principle. The bending deformations of ssDNA-microbeams (one for cantilever beam and another for simply supported beam) are derived. The electric potential in the regions inside and outside the ssDNA layer is obtained by linear Poisson-Boltzmann equation for different electrolyte solutions. The analytical expressions to quantify the beam deflection and the potential difference of ssDNA layer are presented. The theoretical predictions are compared with the experimental data to validate the applicability of the present model. Numerical results reveal that the solution types, thickness and elastic modulus of substrate materials have obvious influence on the deflections of ssDNA-microbeams. Therefore, the present model can help to improve the reading of the bending deformation signal of the microbeam biosensors.","PeriodicalId":54880,"journal":{"name":"Journal of Applied Mechanics-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135321116","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Closed form Expressions of Shear Correction Factor for Functionally Graded Beams 功能梯度梁剪切修正系数的封闭表达式

4区工程技术

Journal of Applied Mechanics-Transactions of the Asme Pub Date : 2023-10-31 DOI: 10.1115/1.4063817

None Amandeep, Anup Kumar Pathak, Srikant Sekhar Padhee

引用次数: 0

Magneto-Mechanical Metamaterials: A Perspective 磁-机械超材料:展望

4区工程技术

Journal of Applied Mechanics-Transactions of the Asme Pub Date : 2023-10-31 DOI: 10.1115/1.4063816

Jay Sim, Ruike Renee Zhao

引用次数: 0

Mechanical Response of Fisherman's Knots during Tightening 结紧时的机械响应

4区工程技术

Journal of Applied Mechanics-Transactions of the Asme Pub Date : 2023-10-26 DOI: 10.1115/1.4063895

Dezhong Tong, MD Khalil, Matthew Justin Silva, Guanjin Wang, Bashir Khoda, Mohammad Khalid Jawed

{"title":"Mechanical Response of Fisherman's Knots during Tightening","authors":"Dezhong Tong, MD Khalil, Matthew Justin Silva, Guanjin Wang, Bashir Khoda, Mohammad Khalid Jawed","doi":"10.1115/1.4063895","DOIUrl":"https://doi.org/10.1115/1.4063895","url":null,"abstract":"Abstract The fisherman's knot, renowned for its strength and reliability, finds applications in engineering and medicine. However, a comprehensive understanding of its mechanics remains limited in scientific literature. In this paper, we present a systematic study of the tightening behavior of the fisherman's knot through a combined approach of tabletop experiments and Discrete Elastic Rods simulations. Our experimental setup involves gradually applying tension to the two ends of the fisherman's knot until it fractures. We observed a correlation between the knot's material properties and its behavior during tightening, leading up to fracture. The tightening process of the fisherman's knot exhibits distinct ``sliding' or ``stretching' motions, influenced by factors such as friction and elastic stiffness. Furthermore, the failure modes of the knot (material fracture and topological failure) are determined by an interplay between elastic stiffness, friction, and initial conditions. This study sheds light on the underlying mechanics of the fisherman's knot and provides insight into its behavior during the tightening process, contributing to the broader understanding of the mechanics of knots in practical applications.","PeriodicalId":54880,"journal":{"name":"Journal of Applied Mechanics-Transactions of the Asme","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134909045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0