第六届全国固体力学青年学者学术研讨会报告综述

简要介绍了在兰州大学召开的第六届全国固体力学青年学者学术研讨会的情况,概括总结了与会学者所做的学术报告内容,并就新时期固体力学的发展提出了一些思考和建议.      

第八届全国固体力学青年学者学术研讨会报告综述

简要介绍了在清华大学召开的第八届全国固体力学青年学者学术研讨会的会议情况,概括总结了与会专家和青年学者所做的学术报告内容,并就固体力学发展所面临的问题和挑战以及学科发展趋势提出了一些思考和建议.      

固体相变过程中的宏细观力学问题及其研究进展

固体相变过程中的力学问题是近年来国际上固体力学与材料科学交叉领域中的一个研究热点,本文就作者在从事与相变有关的力学研究中所涉及到的问题以及国内外进展作一简述和展望,以引起国内学者的关注。      

兰州大学力学学科人才培养与科学研究简介

历史沿革：兰州大学力学专业始建于1958年,是国内较早建立力学专业的学校之一。1981年,固体力学专业成为国家首批批准的硕士与博士学位授权点。1986年,力学学科独立建系;1999年固体力学专业被批准设立“长江学者奖励计划特聘教授”岗位,2003年工程力学硕士点被批准设立,     

会议消息

’９９全国固体力学学术会议由中国力学学会固体力学专业委员会主办,哈尔滨工业大学复合材料研究所承办的’９９全国固体力学学术会议（’９９ＮＣＳＭ）于１９９９年１月７日～９日在哈尔滨工业大学召开,出席本次会议的正式代表共有１００余人,部分力学界老一辈专家、学者应邀出席了会议并在大会上作了精彩的报告,其中包括黄克智院士,中国力学学会理事长白以龙院士,王光远院士,崔俊芝院士．中国工程院院士黄文虎主持了闭幕式的大会报告．本次学术会议共收到论文１０４篇,会议期间交流了８０篇,其中大会特邀报告１１篇（大会开幕式…     

四川大学力学学科简介

四川大学力学学科前身是1954年成立的成都工学院力学教研室。在康振黄、冯广占、陈君楷、宁交贤等老一批科学家与知名学者的带领下,力学学科得到了进一步的建设和发展。1978年恢复建立工程力学系,1986年获得固体力学博士学位授予权,1992年固体力学被评为四川省重点学科。1995年获准建立生物力学工程四川省重点实验室。特别是自2003年以来,以谢和平院士为学术带头人的中、     

第三届全国固体力学青年学者学术研讨会简介

由国家自然科学基金委员会数理科学部发起,国家自然科学基金委员会数理科学部和中国力学学会青年工作委员会主办的"第三届全国固体力学青年学者学术研讨会"于2008年5月23~26日在西安交通大学召开。      

第一届全国实验力学青年学者学术研讨会简介

由国家自然科学基金委员会数理科学部发起,国家自然科学基金委员会数理科学部和中国力学学会实验力学专业委员会主办的``第一届全国实验力学青年学者学术研讨会'于2010年10月29日至31日在北京西郊宾馆召开,清华大学谢惠民教授和冯雪副教授担任会议主席.全国实验力学青年学者学术研讨会是由国家自然科学基金委员会数理科学部和中国力学学会主办的系列会议之一,其宗旨是为40岁以下的从事实验力学的青年学者提供学术交流和合作的平台,深层次探讨实验力学发展的新趋势以及所面临的挑战性科学问题,促进青年学者成长, 为实验力学学科的未来发展提供人才队伍支撑.本届研讨会邀请了全国从事实验力学研究的青年学者35人,涵盖实验固体力学、实验流体力学、实验生物力学、冲击动力学实验、动力学与控制实验等多个领域,并特邀了两位著名的中青年科学家与会. 会议期间,各位代表分别介绍了他们近年来取得的代表性成果,并针对实验力学发展趋势及青年实验力学人才培养等问题开展了深入研讨.国家自然科学基金委数理科学部力学科学处詹世革研究员全程参加了会议.      

‘99全国固体力学学术会议税简介

１会议概况由中国力学学会固体力学专业委员会主办、哈尔滨工业大学复合材料研究所承办的‘９９全国固体力学学术会议（‘９９ＮＣＳＭ）于１９９９年１月７日～９日在哈尔滨工业大学召开。中科院力学所的王自强研究员和哈工大复合材料研究所的杜善义教授共同主持了会议．出席本次会议的正式代表共有１００余人,部分力学界老一辈专家、学者应邀出席了会议并在大会上作了精彩的报告,其中包括中科院院士、清华大学教授黄克智,中科院院士、中科院力学所研究员、中国力学学会理事长白以龙,中国工程院院士、哈尔滨建筑大学教授王光远,中国工…     

2005年全国固体力学青年学者研讨会简介

由国家自然科学基金委员会数理科学部发起,国家自然科学基金委员会数理科学部和中国力学学会主办的“2005年固体力学青年学者研讨会”于2005年10月14～16日在杭州浙江大学召开。本次研讨会主席由清华大学冯西桥和浙江大学陈伟球担任。     

第一届全国物理力学青年学者学术研讨会报告综述

简要介绍了第一届全国物理力学青年学者学术研讨会的情况,对与会学者所做的报告内容进行了总结.      

An RVE-based multiscale modeling method for constitutive relations

This article reports an efficient method to characterize constitutive responses based on multiscale modeling for fluid flow in heterogeneous media based on the concept of representative volume element (RVE). Between different scales, it is considered as the basic principles for down-scaling information the conservation of velocity and of the strain rate tensor. Within this context, we formulate (i) the problem to be solved at the micro-scale, (ii) the up-scaling procedure which involves homogenization rules, and (iii) the generalized principle of multiscale virtual power. The complete theory for constitutive modeling is revisited and shown that when employing multiscale analysis among the suitable variational arguments we are able to obtain, in a straightforward manner, new constitutive behavior between kinematic motions and actions. Some examples of application of fluid flow in heterogeneous media with obstacles are presented to show the consequences of the proposed approach.     

Detailed Cloud Microphysics Simulation for Investigation into the Impact of Sea Spray on Air-Sea Heat Flux

This paper reports on the development of a numerical weather simulation model combined with a detailed spectral-bin cloud microphysics model that can explicitly consider the droplet motion and droplet-atmosphere interactions of sea spray. Sea spray is composed of liquid droplets ejected from the sea surface into the evaporation layer, where it enhances heat as well as momentum exchanges between the atmosphere and the sea. In our study, we analyzed the results of idealized 3D simulations to investigate the impact of sea spray on latent heat exchanges and their consequent impact on boundary layer cloud development. The results show that sea spray enhances the latent heat flux by up to 62 % for the surveyed 10m-height velocities, which ranged from 12 to 42 m/s. They also show that sea spray moistening significantly enhances boundary layer cloud development.     

Population Dynamics of Globally Coupled Degrade-and-Fire Oscillators

This paper reports the analysis of a model of pulse-coupled oscillators with global inhibitory coupling, inspired by experiments on colonies of bacteria-embedded synthetic genetic circuits. Populations are represented by one-dimensional profiles and their time evolution is governed by a singular differential equation. We address the initial value problem and characterize the dynamics’ main features. In particular, we prove that all trajectory behaviors are asymptotically periodic, with asymptotic features only depending on the population cluster distribution and on the model parameters. A criterion is obtained for the existence of attracting periodic orbits, which reveals the existence of a sharp transition as the coupling parameter is increased. The transition separates a regime where any cluster distribution can be obtained in the limit of large times, to a situation where only trajectories with sufficiently large groups of synchronized oscillators perdure.     

Experimental Study on Stabilization of Lifted Swirl Flames in a Model GT Combustor

This study reports on experimental investigations on isothermal and reacting swirled non-premixed flows under varying pressure conditions. In this configuration, a central high speed fuel jet was surrounded by a heated swirling air flow. For the reacting case natural gas served as fuel whereas for isothermal conditions fuel was replaced by a mixture of helium and air to achieve Reynolds-similarity. The optically accessible combustor allowed for application of laser diagnostics. Here we report on Laser Doppler Anemometry and planar laser-induced fluorescence (PLIF) experiments used to characterize the flow field and visualize selected scalars, respectively. Acetone served as a fluorescence marker for mixture fraction investigations. The hydroxyl radical was used to provide general features of the reaction zone such as flame shape and mean stabilization. To expose the influence of pressure on the flame structure three different operating points were investigated varying the combustor pressure between 2 and 6 bar while the inflow bulk velocities remained the same. Striking features of the present configuration are a detached flame, multiple recirculation zones, and complex coherent flow structures.     

3-periodic traveling wave solutions for a dynamical coupled map lattice

In this paper, the existence of periodic traveling wave solutions with a priori unknown velocity is considered for a coupled map lattice dynamical system. By trasforming our problem into one that involves polynomials, explicit 2- and 3-periodic traveling wave solutions are found, while the other solutions can be computed numerically. Since there does not seem to be any reports on explicit traveling wave solutions, we hope that our results will lead to the discovery of many others.     

Origin of anomalous inverse notch effect in bulk metallic glasses

Understanding notch-related failure is crucial for the design of reliable engineering structures. However, substantial controversies exist in the literature on the notch effect in bulk metallic glasses (BMGs), and the underlying physical mechanism responsible for the apparent confusion is still poorly understood. Here we investigate the physical origin of an inverse notch effect in a Zr-based metallic glass, where the tensile strength of the material is dramatically enhanced, rather than decreased (as expected from the stress concentration point of view), by introduction of a notch. Our experiments and molecular dynamics simulations show that the seemingly anomalous inverse notch effect is in fact caused by a transition in failure mechanism from shear banding at the notch tip to cavitation and void coalescence. Based on our theoretical analysis, the transition occurs as the stress triaxiality in the notched sample exceeds a material-dependent threshold value. Our results fill the gap in the current understanding of BMG strength and failure mechanism by resolving the conflicts on notch effects and may inspire re-interpretation of previous reports on BMG fracture toughness where pre-existing notches were routinely adopted.     

Efficient gasification of wet biomass residue to produce middle caloric gas

Various process residues represent a kind of biomass resource already concentrated but containing water as much as 60 wt.%.These materials are generally treated as waste or simply combusted directly to generate heat.Recently,we attempted to convert them into middle caloric gas to substitute for natural gas,as a chemical or a high-rank gaseous fuel for advanced combustion utilities.Such conversion is implemented through dual fluidized bed gasification (DFBG).Concerning the high water content of the fuels,DFBG was suggested to accomplish either with high-efficiency fuel drying in advance or direct decoupling of fuel drying/pyrolysis from char gasification and tar/hydrocarbon reforming.Along with fuel drying,calcium-based catalyst can be impregnated into the fuel,without much additional cost,to increase the fuel's gasification reactivity and to reduce tar formation.This article reports the Ca impregnation method and its resulting effects on gasification reactivity and tar suppression ability.Meanwhile,the principle of directly gasifying wet fuel with decoupled dual fluidized bed gasification (D-DFBG) is also highlighted.     

影响冲击载荷下脆性材料碎片尺度的因素

概括回顾近年我们针对脆性材料受冲击拉伸载荷时的断裂及破碎现象的理论分析及数值模拟成果。重点分析碎片尺度对材料参数及加载速率的依赖关系。通过量纲分析,动力学模拟以及数值实验,建立了一个普适性的无量纲关系用以评估碎片尺度。将本研究结果与其他理论及现有实验结果进行的比较表明本模型更为完善合理。