Journal of Jilin University(Engineering and Technology Edition) ›› 2021, Vol. 51 ›› Issue (3): 792-798.doi: 10.13229/j.cnki.jdxbgxb20200227

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Abdominal injury of vehicle occupant in underbody blast events

Bo WANG1,2(),Yang-yang HE3,Bing-bing NIE1,Shu-cai XU1,Jin-huan ZHANG1()   

  1. 1.State Key Laboratory Automotive Satety and Energy，Tsinghua University，Beijing 100084，China
    2.China North Vehicle Research Institute，Beijing 100072，China
    3.Unit 32184 of the PLA，Beijing 100093，China
  • Received:2020-04-10 Online:2021-05-01 Published:2021-05-07
  • Contact: Jin-huan ZHANG E-mail:wangbo_201@126.com;zhjh@tsinghua.edu.cn

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Abstract:

To better understand the mechanisms and risks of abdominal injuries that result from underbody blast events， a finite element model including the occupant， the vehicle structure and the flow field of explosion was established. The dynamic responses of the thoracic and abdominal organs under the explosion of 6 kg TNT charge were studied， and the effects of seat impact， floor impact and seat belt loading on abdominal pressure were compared. Injury risks of the abdomen during blast loading were evaluated based on two biomechanical predictors： strain energy density of parenchymatous organ and the peak rate of abdominal vascular pressure change. During the process of impact， the occupant was pushed upward by the seat impact， which made the abdomen expanded. When the occupant was separated from the seat， the seat belt restricted the occupant from moving upward， which compressed the abdomen. The simulation results show that the seat impact has the largest effect on the abdominal pressure， followed by the seat belt loading. In the model constructed in this paper， the peak rate of abdominal vascular pressure change was 2.1 kPa/ms which showed that the risk of abdominal injury during blast is low. The present results can be served as a reference for vehicle protection system design.

Key words: vehicle engineering, biomechanics, abdominal injury, underbody blast, finite element human body model

CLC Number: 

  • U461.91

Fig.1

Finite element model"

Fig.2

Chest and abdomen structures of GHBMC"

Fig.3

Deformation of the skeleton"

Fig.4

Abdomen band contours"

Fig.5

Deformation of internal organs"

Table 1

SED of abdominal organs"

部位

SED仿真结果/

(μJ·mm-3)

损伤阈值/

(μJ·mm-3)

阈值出处备注
肝脏2.0

24

15

17.1±4.4

文献[20]

文献[18]

文献[18]

恒河猴的肝脏

猪的肝脏

人体肾皮质组织

肾脏4.4

20

25

27

文献[20]

文献[18]

文献[21]

恒河猴的肾脏

猪的肾脏

人体有限元模型

脾脏2.535文献[21]人体有限元模型

Fig.6

Abdominal vasculature pressure curves withdifferent boundary conditions"

Fig.7

Von Mises Strain distribution ofabdominal and thoracic organs"

Fig.8

Belt force-time curve"

Fig.9

Velocity-time curve of pelvis"

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