The Biaxial Tension-Compression Test Device for the Biomechanical Characterization of Soft Tissue

Abstract

The current biaxial industrial devices used to characterize the mechanical behavior of anisotropic materials in two axes are quite costly. In this study, a simple, economical and practical biaxial tension-compression device that is compatible with universal tensile test machines is developed. It is implemented on Achilles tendon which shows a nonlinear anisotropic mechanical response. The device consists of structural components that transfer loads, linear rails and cars that allow motion, grippers that fixate the specimen, strain gauges and a data acquisition unit. Initially, specimens, obtained from a slaughter shop, were harvested, re-sectioned with a “cross (+)” sign, in which one of the directions is aligned parallel to the fiber directions and the other is directed perpendicular to the fibers. The specimens were tested with the developed device. The collected measurements were filtered. Then, they were evaluated in the Ogden material model to identify the specimen-specific material parameters using curve fitting techniques. The portable and economical device developed in this study and the methodological approach used have the potential to make significant contributions to the field of anisotropic soft tissue biomechanics.

Keywords

• Biaxial Testing
• Ogden Model
• Biomechanical Characterization
• Soft Tissues

Yumuşak Dokunun Biyomekanik Karakterizasyonu için iki Eksenli Çekme-Basma Test Cihazı

Abstract

Anizotropik malzemelerin iki eksende mekanik davranışlarını tespit etmek için mevcut olan endüstriyel çift eksenli makineler oldukça maliyetlidir. Bu çalışmada, evrensel çekme-basma cihazlarıyla uyumlu çalışabilecek basit, ekonomik ve pratik iki eksenli çekme-basma cihazı geliştirilmiştir. Cihaz anizotropik ve doğrusal olmayan davranış sergileyen Aşil tendonu üzerinde test edilmiştir. Cihaz yük taşıyıcı elemanlar, hareketi sağlayan doğrusal ray ve arabalar, numune tutucu çeneler, birim şekil değiştirme rozetleri ve veri alım ünitesinden oluşmaktadır. Öncelikle kasaptan temin edilen dana Aşil tendonlarından, bir yönü fibere paralel, diğer yönü ise fibere dik doğrultuda olacak şekilde “artı (+)” şeklinde örnekler çıkarılmış ve örnekler geliştirilen cihazla test edilmiştir. Elde edilen ölçümler filtrelemeye tabi tutulmuştur. Daha sonra bu ölçümler Ogden malzeme modelinde değerlendirilmiş ve eğri uydurma teknikleriyle numuneye ilişkin parametreler belirlenmiştir. Bu çalışmada geliştirilen portatif ve ekonomik cihaz ile beraberinde uygulanan metodolojik yaklaşım, anizotropik yumuşak doku biyomekaniği alanına önemli katkılar sağlama potansiyeline sahiptir.

Keywords

• İki Eksenli Test
• Ogden Modeli
• Biyomekanik Karakterizasyon
• Yumuşak Dokular

Supporting Institution

Bu çalışma herhangi bir kurum tarafından desteklenmemiştir.

Ethical Statement

Hazırlanan makalede etik kurul izni alınmasına gerek yoktur.

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