Lattice structures have attracted extensive attention in the field of engineering materials due to their characteristics of lightweight and high strength.This paper combines topology optimization with additive manufac...Lattice structures have attracted extensive attention in the field of engineering materials due to their characteristics of lightweight and high strength.This paper combines topology optimization with additive manufacturing to investigate how pore shape in Triply Periodic Minimal Surface(TPMS)structures affects mechanical properties and energy absorption performance.The periodic lattice structures(Triangle lattice,rectangle lattice and Rectangle lattice)and aperiodic mixed structures are designed,including a variety of lattice structures such as circle-circle and triangle-triangle(CCTT),triangle-triangle and rectangle-rectangle(TTRR),circle-circle and rectangle-rectangle(CCRR),triangle-circle-circle-triangle(TCCT),rectangle-triangle-triangle-rectangle(RTTR)and rectangle-circle-circle-rectangle(RCCR).The anisotropy of the unit cells is compared by using the homogenization method.The deformation modes,mechanical properties,and energy absorption efficiency of lattice structures are evaluated systematically by finite element analysis and compression experiments.The results demonstrate that the circle lattice exhibits significantly superior performance in Young’s modulus,compressive strength,toughness,and energy absorption characteristics compared to the triangle lattice and the rectangle lattice.Among aperiodic structures,TCCT shows better comprehensive mechanical properties,while TTRR exhibits relatively inferior performance.The periodic structures possess overall superior mechanical performance.This study demonstrates that the mechanical properties and energy absorption characteristics can be optimized by controlling the pore shape of TPMS lattice structures.This provides an important insight into lightweight structure design in the engineering field.展开更多
Pneumatic actuators and electric actuators have almost been applied to all manufacturing industries. The two kinds of actuators can replace each other in most fields, such as the point to point transmission occasion a...Pneumatic actuators and electric actuators have almost been applied to all manufacturing industries. The two kinds of actuators can replace each other in most fields, such as the point to point transmission occasion and some rotating occasions. However, there are very few research results about the advantages and disadvantages of two kinds of actuators under the same working conditions so far. In this paper, a novel comprehensive assessment method, named as overall life cycle comprehensive assessment （OLCCA）, is proposed for comparison and assessment of pneumatic and electric actuators. OLCCA contains mechanical properties evaluation （MPE）, life cycle cost analysis based on users （LCCABOU） and life cycle environmental impact analysis （LCEIA） algorithm in order to solve three difficult problems： mechanical properties assessment, cost analysis and environmental impact assessment about actuators. The mechanical properties evaluation of actuators is a multi-objective optimization problem. The fuzzy data quantification and information entropy methods are combined to establish MPE algorithm of actuators. Two kinds of pneumatic actuators and electric actuators with similar bearing capacity and similar work stroke were taken for example to verify the correctness of MPE algorithm. The case study of MPE algorithm for actuators verified its correctness. LCCABOU for actuators is also set up. Considering cost complex structure of pneumatic actuators, public device cost even method （PDCEM） is firstly presented to solve cost division of public devices such as compressors, aftercooler, receivers, etc. LCCABOU method is also effective and verified by the three groups of pneumatic actuators and electric actuators. Finally, LCEIA model of actuators is established for the environmental impact assessment of actuators. LCEIA data collection method and model establishment procedure for actuators are also put forward. With Simapro 7, LCEIA comparison results of six actuators can be obtained： Fossil fuels are the major environmental factor of pneumatic and electric actuators; Environmental impact of electric actuator is large than one of pneumatic actuator under the similar mechanical properties and working conditions of pneumatic and electric actuators. The results are correct and correspond with the actual mechanical properties of actuators. This paper proposes a comprehensive evaluation method of the actuators, which can solve the critical problem that similar electromechanical products are very difficult to be compared with each other from the angle of performance, cost and environment impact.展开更多
基金supported by the National Natural Science Foundation of China(Grant 52175236).
文摘Lattice structures have attracted extensive attention in the field of engineering materials due to their characteristics of lightweight and high strength.This paper combines topology optimization with additive manufacturing to investigate how pore shape in Triply Periodic Minimal Surface(TPMS)structures affects mechanical properties and energy absorption performance.The periodic lattice structures(Triangle lattice,rectangle lattice and Rectangle lattice)and aperiodic mixed structures are designed,including a variety of lattice structures such as circle-circle and triangle-triangle(CCTT),triangle-triangle and rectangle-rectangle(TTRR),circle-circle and rectangle-rectangle(CCRR),triangle-circle-circle-triangle(TCCT),rectangle-triangle-triangle-rectangle(RTTR)and rectangle-circle-circle-rectangle(RCCR).The anisotropy of the unit cells is compared by using the homogenization method.The deformation modes,mechanical properties,and energy absorption efficiency of lattice structures are evaluated systematically by finite element analysis and compression experiments.The results demonstrate that the circle lattice exhibits significantly superior performance in Young’s modulus,compressive strength,toughness,and energy absorption characteristics compared to the triangle lattice and the rectangle lattice.Among aperiodic structures,TCCT shows better comprehensive mechanical properties,while TTRR exhibits relatively inferior performance.The periodic structures possess overall superior mechanical performance.This study demonstrates that the mechanical properties and energy absorption characteristics can be optimized by controlling the pore shape of TPMS lattice structures.This provides an important insight into lightweight structure design in the engineering field.
基金Supported by Doctoral Foundation of Henan Polytechnic University(Grant No.B2012-101)Opening Project of Key Laboratory of Precision Manufacturing Technology and Engineering of Henan Polytechnic University,China(Grant No.PMTE201318A)Henan Provincial Science and Technology Research Projects of Education Department of China(Grant No.14B460033)
文摘Pneumatic actuators and electric actuators have almost been applied to all manufacturing industries. The two kinds of actuators can replace each other in most fields, such as the point to point transmission occasion and some rotating occasions. However, there are very few research results about the advantages and disadvantages of two kinds of actuators under the same working conditions so far. In this paper, a novel comprehensive assessment method, named as overall life cycle comprehensive assessment （OLCCA）, is proposed for comparison and assessment of pneumatic and electric actuators. OLCCA contains mechanical properties evaluation （MPE）, life cycle cost analysis based on users （LCCABOU） and life cycle environmental impact analysis （LCEIA） algorithm in order to solve three difficult problems： mechanical properties assessment, cost analysis and environmental impact assessment about actuators. The mechanical properties evaluation of actuators is a multi-objective optimization problem. The fuzzy data quantification and information entropy methods are combined to establish MPE algorithm of actuators. Two kinds of pneumatic actuators and electric actuators with similar bearing capacity and similar work stroke were taken for example to verify the correctness of MPE algorithm. The case study of MPE algorithm for actuators verified its correctness. LCCABOU for actuators is also set up. Considering cost complex structure of pneumatic actuators, public device cost even method （PDCEM） is firstly presented to solve cost division of public devices such as compressors, aftercooler, receivers, etc. LCCABOU method is also effective and verified by the three groups of pneumatic actuators and electric actuators. Finally, LCEIA model of actuators is established for the environmental impact assessment of actuators. LCEIA data collection method and model establishment procedure for actuators are also put forward. With Simapro 7, LCEIA comparison results of six actuators can be obtained： Fossil fuels are the major environmental factor of pneumatic and electric actuators; Environmental impact of electric actuator is large than one of pneumatic actuator under the similar mechanical properties and working conditions of pneumatic and electric actuators. The results are correct and correspond with the actual mechanical properties of actuators. This paper proposes a comprehensive evaluation method of the actuators, which can solve the critical problem that similar electromechanical products are very difficult to be compared with each other from the angle of performance, cost and environment impact.
