Acta Mechanica Sinica最新文献_第2页

Effect of heat-release rate distribution on the propagation stability of detonation waves

IF 3.8 2区工程技术

Acta Mechanica Sinica Pub Date : 2025-02-14 DOI: 10.1007/s10409-024-24519-x

Kepeng Yao (, ), Chun Wang (, ), Guilai Han (, ), Zonglin Jiang (, )

{"title":"Effect of heat-release rate distribution on the propagation stability of detonation waves","authors":"Kepeng Yao \u0000 (, ), Chun Wang \u0000 (, ), Guilai Han \u0000 (, ), Zonglin Jiang \u0000 (, )","doi":"10.1007/s10409-024-24519-x","DOIUrl":"10.1007/s10409-024-24519-x","url":null,"abstract":"<div><p>The distribution of exothermic reaction rates is jointly influenced by reduced activation energy and reaction rate constant. This study focuses on the effect of distribution of exothermic reaction rates on detonation wave propagation instability, specifically under conditions where the length of the induction and exothermic reaction remains constant. It is found that the distribution variation of exothermic reaction rates significantly influences the detonation wave propagation characteristics. Specifically, under conditions of high activation energy, the exothermic reaction rate profile exhibits a smoother distribution but becomes more prone to perturbations. This heightened sensitivity, coupled with the augmented overdriven degree associated with pulsating detonation and cellular detonation wave propagation, further exacerbates the instability characteristics of detonation waves. Especially to the two-dimensional detonation waves with high activation energies, the distribution of exothermic reaction rates becomes more sensitive to these displacements, reinforcing the transverse shock wave and leading to a transformation of the wavefront and cellular structure towards more unstable configurations. This research delves into the intricate interactions between the distribution of exothermic reaction rates and detonation wave instability, aiming to provide an explanatory of detonation instability.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"41 10","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143570988","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Modulation of transformation strain based on crystal orientation effects in NiTi shape memory alloy

IF 3.8 2区工程技术

Acta Mechanica Sinica Pub Date : 2025-02-14 DOI: 10.1007/s10409-024-24223-x

Aimeng Zhang (, ), Su Chen (, ), Chenyang Du (, ), Fa Wu (, ), Chun Li (, ), Shaobin Zhang (, )

{"title":"Modulation of transformation strain based on crystal orientation effects in NiTi shape memory alloy","authors":"Aimeng Zhang \u0000 (, ), Su Chen \u0000 (, ), Chenyang Du \u0000 (, ), Fa Wu \u0000 (, ), Chun Li \u0000 (, ), Shaobin Zhang \u0000 (, )","doi":"10.1007/s10409-024-24223-x","DOIUrl":"10.1007/s10409-024-24223-x","url":null,"abstract":"<div><p>Equiatomic NiTi shape memory alloys (SMAs) can exhibit multiple martensitic transformations from a parent phase, significantly influencing the advanced macroscopic properties of SMAs, such as the large deformation/strain ability. A comprehensive atomic-scale understanding of the selection rule of the martensite phase/variant and its impact on the macroscopic mechanical behavior of SMA could be helpful for the development of high-performance SMAs. This work studies the transformation pathway, preferred martensite variant and corresponding macroscopic behavior of single crystal and bicrystal NiTi SMAs based on molecular dynamics and theoretical analysis. It is found that the transformation strain of single crystal NiTi is significantly influenced by the crystal orientation-dependent transformation pathway and martensite variant. The selection rule is that the transformation pathway and preferred martensite variant, leading to maximum transformation strains for each orientation, are energetically preferred. It can be predicted theoretically and agrees well with the molecular dynamic simulations. In addition, the stress-strain response of bicrystal NiTi can be modulated by changing its transformation pathway based on the orientation effect. This work provides atomic insights into the orientation-dependent deformation ability of NiTi and could be helpful for the development of high-performance SMAs through orientation modulation.</p></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"41 12","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716695","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Effect of temperature and atmosphere on the fracture toughness and failure mechanisms of two-dimensional plain-woven SiCf/SiC composites: Experiments and modeling

IF 3.8 2区工程技术

Acta Mechanica Sinica Pub Date : 2025-02-14 DOI: 10.1007/s10409-024-24333-x

Yong Deng (, ), Yi Hao (, ), Huanfang Wang (, ), Weiguo Li (, ), Qiang Qin (, ), Bing Pan (, ), Chao Zhang (, )

{"title":"Effect of temperature and atmosphere on the fracture toughness and failure mechanisms of two-dimensional plain-woven SiCf/SiC composites: Experiments and modeling","authors":"Yong Deng \u0000 (, ), Yi Hao \u0000 (, ), Huanfang Wang \u0000 (, ), Weiguo Li \u0000 (, ), Qiang Qin \u0000 (, ), Bing Pan \u0000 (, ), Chao Zhang \u0000 (, )","doi":"10.1007/s10409-024-24333-x","DOIUrl":"10.1007/s10409-024-24333-x","url":null,"abstract":"<div><p>Ceramic matrix composites have broad application prospects in the aerospace field due to their high temperature resistance and oxidation resistance. The effect of temperature and environment atmosphere on the fracture toughness and failure mechanisms of two-dimensional plain-woven SiC<sub>f</sub>/SiC composites was investigated. The results show that they exhibit pseudo-plastic deformation behavior at different temperatures. The fracture toughness is as high as 48 MPa m<sup>1/2</sup> at room temperature, and gradually decreases with rising temperature. The difference in fracture toughness between argon and air initially increases and then decreases with rising temperature. Furthermore, the high-temperature failure mechanisms of these composites were analyzed through macro and micro analysis. Based on this, a physic-based temperature-dependent fracture toughness model considering matrix toughness, plastic power, fiber pull-out, and residual thermal stress was developed for fiber-reinforced ceramic matrix composites. The model has been well validated by experimental results. An analysis of influencing factors regarding the evolution of fracture toughness was conducted by the proposed model. This work contributes to a better understanding of the mechanical performance evolution and failure mechanisms of ceramic matrix composites under multi-field coupling conditions, thereby promoting their applications.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"41 12","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143570992","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Correction to: Time-dependent viscoelastic behavior of an LDPE melt 修正：LDPE熔体随时间的粘弹性行为

IF 3.8 2区工程技术

Acta Mechanica Sinica Pub Date : 2025-01-20 DOI: 10.1007/s10409-024-24900-x

Shuxin Huang, Yurun Fan

引用次数: 0

Atomistic study on the effects of short-range order on the creep behavior of TiVTaNb refractory high-entropy alloy at high temperature

IF 3.8 2区工程技术

Acta Mechanica Sinica Pub Date : 2025-01-14 DOI: 10.1007/s10409-024-24478-x

Zhong-Ao Zhang (, ), Yan-Kun Dou (, ), Xin-Fu He (, ), Yong-Peng Zhao (, ), Wen-Jia Jiang (, ), Wen Yang (, )

{"title":"Atomistic study on the effects of short-range order on the creep behavior of TiVTaNb refractory high-entropy alloy at high temperature","authors":"Zhong-Ao Zhang \u0000 (, ), Yan-Kun Dou \u0000 (, ), Xin-Fu He \u0000 (, ), Yong-Peng Zhao \u0000 (, ), Wen-Jia Jiang \u0000 (, ), Wen Yang \u0000 (, )","doi":"10.1007/s10409-024-24478-x","DOIUrl":"10.1007/s10409-024-24478-x","url":null,"abstract":"<div><p>Creep is an important mechanical property of refractory high-entropy alloys (RHEAs) at high temperatures. The existence of short-range order (SRO) and its ability to improve the strength or plasticity of high-entropy alloys (HEAs) have been experimentally proven. However, there is still little research on the correlation between SRO and creep behavior. The mechanism of SRO influencing creep behavior is not yet clear. In this work, the creep behaviors of TiVTaNb RHEA with and without SRO were simulated at various temperatures and stresses using molecular dynamics methods, and the effects of SRO on creep behavior were analyzed. The results show that the SRO is energetically favorable for occurrence in this RHEA. For polycrystalline RHEAs, grain boundary energy is an important driving force for the formation of SRO. Significantly, under the same conditions, the SRO can reduce the steady-state creep rate and change the creep mechanism of the RHEA. Specifically, the models with SRO will exhibit lower stress exponent and grain-size exponent. A mechanism by which SRO reduces the effects of grain boundaries on creep has been discovered. These phenomena can be well explained by the effects of SRO on atomic diffusion. In addition, by analyzing the diffusion ability of different elements, SRO can induce localization of atomic diffusion, resulting in strain localization under high stresses. This work highlights the importance of SRO on the creep of RHEAs and provides a reference for establishing a reasonable creep model of RHEAs.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"41 12","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645444","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Efficient obstacle avoidance planning for multi-robot suspension system based on a collaborative optimization for force and position

IF 3.8 2区工程技术

Acta Mechanica Sinica Pub Date : 2025-01-14 DOI: 10.1007/s10409-024-24456-x

Xiangtang Zhao (, ), Zhigang Zhao (, ), Cheng Su (, ), Jiadong Meng (, ), Hutang Sang (, )

{"title":"Efficient obstacle avoidance planning for multi-robot suspension system based on a collaborative optimization for force and position","authors":"Xiangtang Zhao \u0000 (, ), Zhigang Zhao \u0000 (, ), Cheng Su \u0000 (, ), Jiadong Meng \u0000 (, ), Hutang Sang \u0000 (, )","doi":"10.1007/s10409-024-24456-x","DOIUrl":"10.1007/s10409-024-24456-x","url":null,"abstract":"<div><p>To avoid collisions between a suspended object, cables, towing robots, and obstacles in the environment in a multi-robot suspension system, obstacle avoidance planning was studied based on a collaborative optimization method for force and position. Based on the analysis of the kinematics and dynamics of the system, the inverse kinematics and inverse dynamics of the system are solved using the least variance method. The obstacle avoidance planning is performed in the solved collision-free feasible space using the stable dung beetle optimization (SDBO) algorithm, which ensures that the suspended object can move stably to the target point in the workspace. The optimal obstacle avoidance trajectory of the multi-robot suspension system can be accurately determined by using the collaborative optimization method for force and position to plan the towing robot and the cable. Finally, the correctness of the obstacle avoidance planning method is verified by simulations. By taking a special scenario, the remarkable findings reveal that the SDBO algorithm outperforms the dung beetle optimization algorithm by reducing the length of the planned trajectory of the suspended object by 14.51% and the height by 79.88%, and reducing the minimum fitness by 95.84% and the average fitness by 94.77%. The results can help the multi-robot suspension system to perform various towing tasks safely and stably, and extend the related planning and control theory.\u0000</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"41 12","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143778154","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Receptivity of a hypersonic blunt cone boundary layer to freestream entropy and vorticity waves

IF 3.8 2区工程技术

Acta Mechanica Sinica Pub Date : 2025-01-13 DOI: 10.1007/s10409-024-24464-x

Menghao Niu (, ), Caihong Su (, )

{"title":"Receptivity of a hypersonic blunt cone boundary layer to freestream entropy and vorticity waves","authors":"Menghao Niu \u0000 (, ), Caihong Su \u0000 (, )","doi":"10.1007/s10409-024-24464-x","DOIUrl":"10.1007/s10409-024-24464-x","url":null,"abstract":"<div><p>Hypersonic boundary-layer receptivity to freestream entropy and vorticity waves is investigated using direct numerical simulations for a Mach 6 flow over a 5.08 mm nose radius cone. Two frequencies of 33 kHz and 150 kHz are considered to be representative of the first and second instability modes, respectively. For the first mode, wall pressure fluctuations for both entropy and vorticity wave cases exhibit a strong modulation yet without a growing trend, indicating that the first mode is not generated despite its instability predicted by linear stability theory. The potential reason for this is the absence of postshock slow acoustic waves capable of synchronizing with the first mode. By contrast, for the second mode, a typical three-stage boundary-layer response is observed, consistent with that to slow acoustic waves studied previously. Furthermore, the postshock disturbances outside the boundary layer can be decomposed into the entropy (density/temperature fluctuations) and vorticity components (velocity fluctuations), and the latter is shown to play a leading role in generating the second mode, even for the case with entropy waves where the density/temperature fluctuations dominate the postshock regions.</p></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"41 6","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143496854","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Optimal design and dynamic performance analysis of HMDV suspension based on bridge network

IF 3.8 2区工程技术

Acta Mechanica Sinica Pub Date : 2025-01-10 DOI: 10.1007/s10409-024-24208-x

Xiaofeng Yang (, ), Yan Yan (, ), Yujie Shen (, ), Xiaofu Liu (, ), Zhipeng Wang (, )

{"title":"Optimal design and dynamic performance analysis of HMDV suspension based on bridge network","authors":"Xiaofeng Yang \u0000 (, ), Yan Yan \u0000 (, ), Yujie Shen \u0000 (, ), Xiaofu Liu \u0000 (, ), Zhipeng Wang \u0000 (, )","doi":"10.1007/s10409-024-24208-x","DOIUrl":"10.1007/s10409-024-24208-x","url":null,"abstract":"<div><p>In order to solve the vertical vibration negative effect problem caused by the increase of the unsprung mass in the hub motor driven vehicle (HMDV), a novel mechatronic suspension using the bridge electrical network is proposed. Firstly, the bridge electrical networks composed of two capacitors, two inductors, and one resistor are summarized and their impedance functions are analyzed forward through the structural method. Then a quarter HMDV model is constructed, and the optimal element parameters in the electrical networks are selected through the Pattern Search algorithm. The influence of element parameters perturbation of the optimal structure on the output response of HMDV suspension is further analyzed. Results show that the proposed bridge electrical network can be realized as a biquartic impedance. It can be equivalent to a mechanical impedance of the suspension through a linear motor. Compared with the conventional suspension, the root-mean-square values of the dynamic tire load and the suspension working space are reduced by 10.76% and 18.10%, respectively. The vibration at low and high frequencies of the unsprung mass is suppressed, effectively improving the grounding and handling stability of the vehicle.\u0000</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"41 12","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716909","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Investigation of a nonlinear energy sink based on magnetic inerter 基于磁干涉仪的非线性能量阱研究

IF 3.8 2区工程技术

Acta Mechanica Sinica Pub Date : 2025-01-08 DOI: 10.1007/s10409-024-24407-x

Zhi Sun (, ), Jinglei Zhao (, ), Chunlin Zhang (, ), Shujin Yuan (, ), Xuyang Zheng (, ), Jun Luo (, ), Huayan Pu (, )

{"title":"Investigation of a nonlinear energy sink based on magnetic inerter","authors":"Zhi Sun \u0000 (, ), Jinglei Zhao \u0000 (, ), Chunlin Zhang \u0000 (, ), Shujin Yuan \u0000 (, ), Xuyang Zheng \u0000 (, ), Jun Luo \u0000 (, ), Huayan Pu \u0000 (, )","doi":"10.1007/s10409-024-24407-x","DOIUrl":"10.1007/s10409-024-24407-x","url":null,"abstract":"<div><p>Nonlinear characteristics have demonstrated significant advantages in mitigating vibrations across various engineering applications, particularly in effectively suppressing vibrations over a wide frequency range. This paper introduces a novel nonlinear energy sink with a magnetic inerter (MINES). The MINES features a magnetic lead screw that incorporates a pair of helical permanent magnets. When the inner part undergoes linear motion, it is transformed into the rotation of the outer part at a predetermined conversion ratio. Subsequently, the MINES is incorporated into a system with a single degree of freedom, and the corresponding differential equations of motion are derived. The approximate analytical method and the numerical method are used to validate each other. This process clarifies the effectiveness of the MINES in reducing vibrations when subjected to harmonic excitation. The influence of the parameters of the MINES is analyzed. The findings demonstrate that the MINES offers significant benefits in terms of vibration suppression efficiency when the depths of the three barriers are equal. Furthermore, with the increase in excitation amplitude, the MINES enters the nonlinear range, leading to a reduction in system damping. This can effectively prevent the phenomenon of traditional damping stiffening under conditions of high amplitude excitation. Finally, the vibration reduction capability of this nonlinear energy sink was experimentally demonstrated, enhancing its applicability in vibration mitigation.</p></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"41 10","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994352","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Stress wave scaling theory of bar with variable cross-section 变截面杆的应力波标度理论

IF 3.8 2区工程技术

Acta Mechanica Sinica Pub Date : 2025-01-08 DOI: 10.1007/s10409-024-24509-x

Xumeng Ren (, ), Shujuan Hou (, ), Xu Han (, )

{"title":"Stress wave scaling theory of bar with variable cross-section","authors":"Xumeng Ren \u0000 (, ), Shujuan Hou \u0000 (, ), Xu Han \u0000 (, )","doi":"10.1007/s10409-024-24509-x","DOIUrl":"10.1007/s10409-024-24509-x","url":null,"abstract":"<div><p>The coconut structure exhibits inherent impact resistance, with the macroscopically ordered distribution of variable cross-section fibers in its husk playing a crucial role in stress wave propagation and scaling. Inspired by the natural structure and fibers, this study proposes a stress wave propagation model for a variable cross-section bar considering viscous effects. A theoretical model for stress wave propagation in a fusiform-shaped bar with variable cross-section is established, elucidating the stress wave scaling effect observed in coconut fibers. Additionally, a quasi-one-dimensional method for analyzing and measuring stress wave propagation is introduced, and an experimental setup is assembled. Experimental validation of the stress wave scaling effect confirms the theory’s accuracy for stress wave scaling in variable cross-section bars. This research provides theoretical guidance and measurement methods for the design of space landers, automobile anti-collision beams, stress wave collectors, and scalers, as well as for impact testing of macro and micro materials and the design of sustainable plant-based materials for impact protection.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"41 10","pages":""},"PeriodicalIF":3.8,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142994353","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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