Effective mitigation of the thermal short and expansion mismatch effects of an integrated thermal protection system through topology optimization

Yang, Qiang; Meng, Sheng; Xie, Weihua; Jin, Hua; Xu, Chenghai; Du, Shiyu

doi:10.1016/j.compositesb.2017.03.038

Cited by 23 publications

(2 citation statements)

References 43 publications

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“…Although the webs help enhance the structural stiffness and maintain the configuration of the ITPS, they simultaneously induce the thermal short effect due to the high thermal conductivity. Furthermore, when the TFS reaches a high temperature during flight, the BFS remains at a relatively low temperature, leading to the thermal expansion mismatch of the webs [7]. For some configurations of the ITPS, local buckling occurs on the webs due to the existence of thermal compressive stresses and in-plane mechanical compressive loads, which might lead to catastrophic failure indirectly.…”

Section: Introductionmentioning

confidence: 99%

Optimization and Re-Design of Integrated Thermal Protection Systems Considering Thermo-Mechanical Performance

Shu

Meng

2021

Applied Sciences

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Integrated thermal protection system (ITPS) is regarded as one of the most promising thermal protection concepts with both thermal insulation and load-bearing capacities. However, the traditional layout of webs could inevitably lead to thermal short effects and high risk of buckling failure of the ITPS. A topological optimization method for the unit cell of the ITPS was established to minimize the equivalent thermal conductivity and elastic strain energy with the constraint of maintaining structural efficiency. The ITPS was re-designed consulting the optimized cell configuration. In order to control the buckling-mode shape and the associated buckling load of the ITPS, the new design was further optimized, subjected to the total weight of the initial design. Detailed finite element models were established to validate the structural responses. By contrast, the optimized design presents lower bottom surface temperature and better thermal buckling characteristics, performing a better balance between thermal insulation and load-bearing constraints.

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Section: Introductionmentioning

confidence: 99%

Optimization and Re-Design of Integrated Thermal Protection Systems Considering Thermo-Mechanical Performance

Shu

Meng

2021

Applied Sciences

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“…Hence, a sandwich structure appeared to replace this intertwined co‐continuous structure. The typical sandwich structure with two strong and stiff thin sheets, denoted skins, separated by a low density core is a bearing structure with excellent mechanical performance, impact resistance and multi‐functional potentials . Therefore, the sandwich composite structure can be widely used in aerospace, sporting and automotive applications.…”

Section: Introductionmentioning

confidence: 99%

A novel combination of sandwich and co‐continuous structure based on polypropylene and styrene‐butadiene‐styrene block copolymer formed with wide range of polypropylene content

Wang

Zhang

2018

J of Applied Polymer Sci

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The styrene-butadiene-styrene block copolymer (SBS)/polypropylene (PP) blends with a unique sandwich layered cocontinuous structure were prepared by melt compounding. Differing from single conventional co-continuous and sandwich structure, this structure was formed, where pure PP and co-continuous SBS/PP phase acting as the face sheets and core. Even though the volume content was 20 or 10 vol %, PP always amazingly formed a continuous phase in SBS/PP blends, whereas the morphology of SBS phase relatively changed from dispersed particles to continuous network as its content increased to 50 vol %. For immiscible SBS/PP blends, due to the huge difference of complex viscosity and surface tension between SBS and PP, a pure PP layer existed on the surface of blends which can be ascribed to the PP enrichment. Herein, the structure of blends with more than 50 vol % SBS was presented as sandwich layered co-continuous structure by combining the pure PP layer and co-continuous structure. V C 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46580.

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Dynamic topology optimization considering the influence of the non‐uniform temperature field

Zhang,

Li,

Zhao

et al. 2024

Numerical Meth Engineering

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With the wide application of thermoelastic structures in industries such as the aerospace field, the problem of topology optimization of thermoelastic structures has become a very common and important research topic. It is well known that the thermal environment has a non‐negligible influence on the dynamic performance of structures. However, few people consider the influence of the thermal environment on structural stiffness in thermoelastic dynamic topology optimization. In practical engineering applications, the influence of the environment on the structure performance should be considered to obtain the optimal structure. In this paper, we focus on the problem of dynamic topology optimization considering the effect of non‐uniform temperature fields on structural stiffness. The influence of non‐uniform temperature fields adds on structural stiffness to the topology optimization of thermoelastic dynamic for the first time, thereby comprehensively addressing its effects on structural stiffness in the context of dynamic topology optimization under harmonic vibration and transient load. The proposed method begins by computing the distribution of the non‐uniform temperature field within the structure. Subsequently, thermal stresses in the structure are determined through the application of thermoelastic theory. The geometric stiffness matrix of the structure is then calculated using finite element theory. The dynamic topology optimization model, employing a variable density approach, is established in conjunction with the dynamic compliance design objective. Sensitivity analysis is conducted through the adjoint method, and the design variables are updated utilizing the method of moving asymptotes. Numerical examples are presented to validate the efficacy of the proposed method and obtain the influence of different factors on the optimization results. The results show that the dynamic compliance of the optimized structure increases with increasing heat flux. For the optimization under harmonic vibration, the optimization results obtained by different external excitation frequencies are significantly different. For transient optimization, the study discovers that the optimization present transient effect.

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Effective mitigation of the thermal short and expansion mismatch effects of an integrated thermal protection system through topology optimization

Cited by 23 publications

References 43 publications

Optimization and Re-Design of Integrated Thermal Protection Systems Considering Thermo-Mechanical Performance

Optimization and Re-Design of Integrated Thermal Protection Systems Considering Thermo-Mechanical Performance

A novel combination of sandwich and co‐continuous structure based on polypropylene and styrene‐butadiene‐styrene block copolymer formed with wide range of polypropylene content

Dynamic topology optimization considering the influence of the non‐uniform temperature field

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