Establishment And Application Of Finite Element Model Of Foot-ice Hockey Skates

Research purpose and significance:To establish an effective finite element model of foot-hockey shoes.Through the simulation of the ice pedaling action of the model,the related data such as the stress and strain of the foot and the ankle during the ice kicking process are obtained.The impact of biomechanical characteristics of the ankle provides reliable methods and means,and provides a theoretical basis for improving ice hockey technology.At the same time,the effects of different kick angles and different arch support heights on the stress and strain of the ankle were analyzed through simulation to provide data support for the design and improvement of the skates.Research method:Use CT flat scan method to obtain the two-dimensional imaging data of the right foot of the hockey skates without weight-bearing neutral position of the subject,use MIMICS19.0 software to establish the foot shoe upper model,and use UGNX10.0 software to stitch the surface to establish the foot Sneakers solid model,and use SOLIDWORKS2017 software to establish foot cartilage,establish foot fascia and ligament in ANSYS WORKBENCH 19.1 software,the fascia is established using LINK180 unit,and ligament is simulated using spring unit;use 3D laser scanner to scan the blade and knife Drag to obtain the point cloud model of the ice skate,and use the GEOMAGIC DESIGN X64 software to establish the ice skate solid model.Use GEOMAGIC STUDIO2013 software and SOLIDWORKS2017 software to complete the segmentation of the ice hockey shoe model;import the solid model of the foot,ice hockey shoe and ice skate into ANSYS WORKBENCH19.1 to define the contact,and use the WAW-600E microcomputer to control the electrohydraulic servo universal testing machine to test each part of the ice hockey shoe The mechanical properties of the material give the ice hockey shoe model accurate material properties,and finally the establishment of the foot-hockey shoe finite element model.Collect the pressure peak and contact area of the foot(knife)bottom of the subject when the ice hockey skates feet stand in a balanced manner with the Novel emed sole pressure test board and Pedar pressure-sensing insole at a collection frequency of 100HZ,and simulate the human feet with ANSYS WORKBENCH 19.1 software Compare the results of static analysis of static standing balance to verify the model.The two SONY high-speed cameras were used for three-dimensional high-speed shooting at a shooting frequency of 60 Hz.The video analysis system was used to calculate the angle range of the ice hockey player’s pedaling process.Using the finite element model of foot-ice hockey shoes established in this study in ANSYS WORKBENCH 19.1 software to simulate the stress of the first metatarsophalangeal joint,tibia and fibula,subtalar joint,and blade bottom at different moments of ice pedaling and different arch pad heights on the ice pedal.And other indicators.Research results:(1)The established finite element model of foot-hockey shoes includes a foot model and a hockey shoe model,which includes 320,733 element nodes and 203,996 elements.(2)The peak pressure measured on the blade of the ice skate is 930KPa,the peak pressure on the blade of the finite element simulation is 1022KPa,the error percentage is 9.9%;the total contact area of the blade is measured at 25.5cm~2,and the total contact area of the blade is measured by finite element simulation.23.5cm~2,error percentage is 8.51%;peak value of measured plantar pressure is 77.5KPa,peak value of finite element simulated plantar pressure is 72.1KPa,error percentage is 6.99%,compared with the actual measurement,the simulation result at the first metatarsophalangeal joint is 8.60%smaller,The heel simulation result is 4.33%smaller.(3)Compared with the bone stress at 90 degrees,the stress at the tibia and fibula at 80,70,and 60 degrees increases by 54.73%,137.36%,and 254.65%respectively;the joint stress at 80,70,and 60 degrees increases by 19.98%,35.73%,52.96%;plantar fascia stress at 80,70,and 60 degrees increased by 14.36%,141.22%,and 151.02%respectively;first metatarsophalangeal joint stress at 80,70,and 60 degrees increased by 12.04%,13.33%,and 17.70%respectively;compared with the stress at the bottom of the blade at an angle of 90 degrees,the pedals at 80,70,and 60 degrees increase by6.89%,11.15%,and 16.26%respectively;the maximum strain at the bottom of the blade is at the blade when the ice is pedaled at 90 degrees In the middle of the bottom,the deformation angle is 9 degrees.When pedaling at 80,70,and 60 degrees,the maximum strain position of the blade bottom is at the front end of the blade bottom,and the deformation angles are 4 degrees,15 degrees,and 29 degrees.(4)The height of the arch pad has little effect on the tibiofibular stress and subtalar joint stress.The stress of the first metatarsophalangeal joint when pedaling at different angles reduced the total arch support by 6.88%to 8.05%compared to the half-arch support,and decreased 8.03%to 16.6%compared to the non-arch support.Conclusions and suggestions:(1)The finite element model of the foot-hockey shoes established in this study can effectively simulate and calculate the stress and strain of the foot(skate)during the hockey process.(2)Changing the angle of ice hockey players will affect the stress and strain of the ankles and ice skates.As the ice hockey player decreases the ice angle,the tibia and fibula,the subtalar joint,the first metatarsophalangeal joint,and the sole of the foot The stress of fascia and other parameters increased,so did the blade stress and ice skate strain.(3)Changing the height of the arch pad of the hockey shoes will affect the stress of the foot.With the reduction of the arch support height,the stress of the tibiofibular joint and subtalar joint will be slightly different,and the stress of the first metatarsophalangeal joint will increase significantly.Big.