Experimental study on the effects of shear stress on viscoelastic properties of the intestines

  • Jie LiEmail author
  • XiaoNan Bi
  • Ke Zhang
  • Cheng Zhang
  • Hao Liu


Shear deformation induced by shear stress is one of the major forms of interaction between the locomotion mechanism and the intestines. Relatively few experimental studies using locomotion mechanisms have been performed to investigate the viscoelastic property of intestines. There is a lack of reliable data regarding the relative movement between various locomotion mechanisms and the small intestine, and how that movement affects the measurement of shear displacement. In this work, a novel platform was constructed with two elaborately designed clamps that could securely fix both sides of an intestine sample using negative gas adsorption. The platform was also integrated with noncontact measuring equipment to record the thickness of the intestine sample. Subsequently, preservation measure was applied to porcine intestine, and multiple intestine samples were prepared and tested under strains of 20%, 50%, 80% and 100%. A five-element viscoelastic model that was fitted to multiple sets of data could accurately predict the biomechanical property of the intestines. Finally, a new criterion, the loss factor, was calculated with the parameters of the five-element model to represent the dynamic behavior of soft tissue, and it was used to verify the reliability and effectiveness of the experimental setup and results.


shear stress nonlinear viscoelastic property intestine loss factor negative gas adsorption 


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Copyright information

© Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Jie Li
    • 1
    • 2
    • 3
    Email author
  • XiaoNan Bi
    • 1
  • Ke Zhang
    • 1
    • 3
  • Cheng Zhang
    • 2
    • 3
  • Hao Liu
    • 2
    • 3
  1. 1.School of Mechanical EngineeringShenyang Jianzhu UniversityShenyangChina
  2. 2.State Key Laboratory of RoboticsShenyang Institute of Automation (SIA), Chinese Academy of SciencesShenyangChina
  3. 3.Liaoning Provincial Key Laboratory of Minimally Invasive Surgical RobotShenyangChina

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