Journal of Mechanics最新文献_第10页

On the thermal instability of supercavitating liquid jet surrounded by coaxial rotary gas 同轴旋转气体包围超空泡液体射流的热不稳定性研究

IF 1.7 4区工程技术

Journal of Mechanics Pub Date : 2021-09-25 DOI: 10.1093/jom/ufab024

M. Lü, Z. Ning

引用次数: 0

Development of an adaptive explicit algorithm for static simulation using the vector form intrinsic finite element method 基于矢量形式内禀有限元法的自适应显式静态仿真算法的发展

IF 1.7 4区工程技术

Journal of Mechanics Pub Date : 2021-09-25 DOI: 10.1093/jom/ufab022

Mien-Li Wang, C. Chuang, J. Lee

引用次数: 0

Analysis of the effect of oil inlet size on the static performance characteristics of non-Newtonian lubricated hole-entry hybrid journal bearings 进油尺寸对非牛顿润滑孔-入口混合式滑动轴承静态性能特性的影响分析

IF 1.7 4区工程技术

Journal of Mechanics Pub Date : 2021-08-10 DOI: 10.1093/jom/ufab020

Haiyin Cao, Yu Huang, Y. Rong, Hao Wu, Minghui Guo

引用次数: 2

Fracture analysis for materials by a stable generalized/extended finite element method 基于稳定广义/扩展有限元的材料断裂分析

IF 1.7 4区工程技术

Journal of Mechanics Pub Date : 2021-08-10 DOI: 10.1093/jom/ufab019

H. Jia, Y. Zhao, Y. Nie, S. Q. Li

引用次数: 1

Implementation of a parallel high-order WENO-type Euler equation solver using a CUDA PTX paradigm 使用CUDA PTX范式实现并行高阶WENO型Euler方程求解器

IF 1.7 4区工程技术

Journal of Mechanics Pub Date : 2021-08-10 DOI: 10.1093/jom/ufab016

F. Kuo, J. S. Wu

{"title":"Implementation of a parallel high-order WENO-type Euler equation solver using a CUDA PTX paradigm","authors":"F. Kuo, J. S. Wu","doi":"10.1093/jom/ufab016","DOIUrl":"https://doi.org/10.1093/jom/ufab016","url":null,"abstract":"\u0000 This study proposes the optimization of a low-level assembly code to reconstruct the flux for a splitting flux Harten–Lax–van Leer (SHLL) scheme on high-end graphic processing units. The proposed solver is implemented using the weighted essentially non-oscillatory reconstruction method to simulate compressible gas flows that are derived using an unsteady Euler equation. Instructions in the low-level assembly code, i.e. parallel thread execution and instruction set architecture in compute unified device architecture (CUDA), are used to optimize the CUDA kernel for the flux reconstruction method. The flux reconstruction method is a fifth-order one that is used to process the high-resolution intercell flux for achieving a highly localized scheme, such as the high-order implementation of SHLL scheme. Many benchmarking test cases including shock-tube and four-shock problems are demonstrated and compared. The results show that the reconstruction method is computationally very intensive and can achieve excellent performance up to 5183 GFLOP/s, ∼66% of peak performance of NVIDIA V100, using the low-level CUDA assembly code. The computational efficiency is twice the value as compared with the previous studies. The CUDA assembly code reduces 26.7% calculation and increases 37.5% bandwidth. The results show that the optimal kernel reaches up to 990 GB/s for the bandwidth. The overall efficiency of bandwidth and computation performance achieves 127% of the predicted performance based on the HBM2-memory roofline model estimated by Empirical Roofline Tool.","PeriodicalId":50136,"journal":{"name":"Journal of Mechanics","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2021-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49655167","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: 1

Corrigendum to: Nonlinear free vibration of size-dependent microbeams with nonlinear elasticity under various boundary conditions 不同边界条件下具有非线性弹性的尺寸相关微梁的非线性自由振动

IF 1.7 4区工程技术

Journal of Mechanics Pub Date : 2021-07-21 DOI: 10.1093/jom/ufab018

F. Lin, J. Peng, S. Xue, L. Yang, J. Yang

引用次数: 0

A thermodynamically nonlocal damage model using a surface-residual-based nonlocal stress 基于表面残余的非局部应力的热力学非局部损伤模型

IF 1.7 4区工程技术

Journal of Mechanics Pub Date : 2021-07-21 DOI: 10.1093/jom/ufab017

Liyang Huang, Yin Yao

{"title":"A thermodynamically nonlocal damage model using a surface-residual-based nonlocal stress","authors":"Liyang Huang, Yin Yao","doi":"10.1093/jom/ufab017","DOIUrl":"https://doi.org/10.1093/jom/ufab017","url":null,"abstract":"\u0000 In this research, a surface-residual-based nonlocal stress was introduced into nonlocal damage theory to describe the long-range actions among microstructures that were excluded in the definition of Cauchy stress. By using the surface-residual-based nonlocal stress tensor, a thermodynamically consistent nonlocal integral damage model was established to simulate the strain localization behavior for elastic-brittle damage problems. In this model, both the strain and the damage were taken as nonlocal variables in the free energy function, and the integral-type damage constitutive relationships and the evolution equation were derived via thermodynamic laws in order to ensure the self-consistency within the thermodynamic framework. Based on the nonlocal damage formulations using a real nonlocal stress concept, we simulated the strain localization phenomenon in an elastic bar subjected to uniaxial tension. The results showed clear localizing and softening features of strain in the damage zone, and the boundary effects arising from the nonlocal surface residual were illuminated. Furthermore, the strain localization behaviors for different internal characteristic lengths were simulated, through which we found that the characteristic length was comparable to the size of the strain localization zone.","PeriodicalId":50136,"journal":{"name":"Journal of Mechanics","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2021-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41414758","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: 2

Construction of a curve by using the state equation of Frenet formula 用法涅特公式的状态方程构造曲线

IF 1.7 4区工程技术

Journal of Mechanics Pub Date : 2021-06-30 DOI: 10.1093/jom/ufab014

J. Chen, J. W. Lee, S. Kao, Y. Chou

{"title":"Construction of a curve by using the state equation of Frenet formula","authors":"J. Chen, J. W. Lee, S. Kao, Y. Chou","doi":"10.1093/jom/ufab014","DOIUrl":"https://doi.org/10.1093/jom/ufab014","url":null,"abstract":"\u0000 In this paper, the available formulae for the curvature of plane curve are reviewed not only for the time-like but also for the space-like parameter curve. Two ways to describe the curve are proposed. One is the straight way to obtain the Frenet formula according to the given curve of parameter form. The other is that we can construct the curve by solving the state equation of Frenet formula subject to the initial position, the initial tangent, normal and binormal vectors, and the given radius of curvature and torsion constant. The remainder theorem of the matrix and the Cayley–Hamilton theorem are both employed to solve the Frenet equation. We review the available formulae of the radius of curvature and examine their equivalence. Through the Frenet formula, the relation among different expressions for the radius of curvature formulae can be linked. Therefore, we can integrate the formulae in the engineering mathematics, calculus, mechanics of materials and dynamics. Besides, biproduct of two new and simpler formulae and the available four formulae in the textbook of the radius of curvature yield the same radius of curvature for the plane curve. Linkage of centrifugal force and radius of curvature is also addressed. A demonstrative example of the cycloid is given. Finally, we use the two new formulae to obtain the radius of curvature for four curves, namely a circle. The equivalence is also proved. Animation for 2D and 3D curves is also provided by using the Mathematica software to demonstrate the validity of the present approach.","PeriodicalId":50136,"journal":{"name":"Journal of Mechanics","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44845196","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: 1

Characterizing the hyper-viscoelastic behavior of adhesive films 胶膜超粘弹性行为的表征

IF 1.7 4区工程技术

Journal of Mechanics Pub Date : 2021-06-15 DOI: 10.1093/JOM/UFAB013

H. Hsu, J. Tsai

引用次数: 3

Experimental study on two consecutive droplets impacting onto an inclined solid surface 两个连续液滴撞击倾斜固体表面的实验研究

IF 1.7 4区工程技术

Journal of Mechanics Pub Date : 2021-06-12 DOI: 10.1093/JOM/UFAB012

Chun-Kuei Chen, Sheng-Qi Chen, Wei‐Mon Yan, Wen‐Ken Li, Ta-Hui Lin

{"title":"Experimental study on two consecutive droplets impacting onto an inclined solid surface","authors":"Chun-Kuei Chen, Sheng-Qi Chen, Wei‐Mon Yan, Wen‐Ken Li, Ta-Hui Lin","doi":"10.1093/JOM/UFAB012","DOIUrl":"https://doi.org/10.1093/JOM/UFAB012","url":null,"abstract":"\u0000 The present study is concerned with the experimental impingement of two consecutive droplets on an inclined solid surface. Attention is mainly paid to the effects of impingement timing with various oblique angles (Φ) of the surface on the impact phenomena, which mainly affect the maximum droplet spreading diameter. The investigation considers four impingement scenarios differentiated by impingement timing, namely Case 1: single-droplet impingement; Case 2 of Δt1: the moment when the leading droplet starts spreading along the oblique surface; Case 3 of Δt2: the moment when the leading droplet reaches its maximum spreading; and Case 4 of Δt3: the moment when the leading droplet starts retracting. It is observed that deformation behavior of two successive droplets impacting on the inclined surface experiences a complex asymmetric morphology evolution due to the enhancement of gravity effect and various conditions of the impingement timing. The merged droplet becomes slender with increasing oblique surface angle in the final steady shape, causing the decrease in the value of front and back contact angles. The impingement timing has a significant influence on the change of the maximum height of the merged droplet. The coalesced droplet spreads to the maximum dimensionless width diameter at Δt = Δt2 and the oblique angle of Φ = 45°, but reaches the maximum dimensionless height for Δt = Δt2 at Φ = 30°. The front contact angles converge to a fixed value eventually for all conditions of impingement timing, and the values become lower with the increasing surface inclination.","PeriodicalId":50136,"journal":{"name":"Journal of Mechanics","volume":" ","pages":""},"PeriodicalIF":1.7,"publicationDate":"2021-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45766840","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: 1