Supraspinatus Tensile Data and Processing Files

Filename: TestData.xlsx
The data is test stress-strain data for cadaveric human supraspinatus tendon obtained in a uni-axial tensile test on MTS EM Tension testing equipment at University of South Africa's Biomechanics Research Laboratory. The equipment was operated in displacement mode on all the three tests at 0.1 s-1 of strain rate. The samples were not preconditioned. All columns are appropriately labelled to enable researchers to understand what each column represents. The test equipment did not have an environmental chamber at the time of the test so the samples were inevitably exposed to varying conditions before and during the test procedure.
Filename: Hyperelastic_vs_Viscoelastic_Nonlin_Modelling.m
This is a main processing MATLAB program file. It calculates the stress using nonlinear least squares curve fitting routine.
Filename: funTestData_ShoulderTendon.m
The function is called by the above file to fetch test data from the Excel file 'TestData.xlsx' and extracts only the section within the elastic region. There are three tests in the file and each test data is different in terms of the upper limit of the elastic region. The function calls each test data as specified in its argument.
Filename: funyehmod.m
This MATLAB function implements the Yeoh material model.
Filename: funstdnonlinsolid.m
This MATLAB function implements the standard nonlinear solid model using the sigmoidal kernel function.

文件名：TestData.xlsx
本数据集收录了南非大学生物力学研究实验室在MTS EM拉伸试验设备上，通过对尸体人肩袖肌腱进行单轴拉伸试验所获得的一系列测试应力-应变数据。试验过程中，设备以应变率为0.1秒^-1的模式进行位移控制，且未对样品进行预调适处理。所有数据列均进行了适当标注，以便研究者明了每列所代表的意义。由于测试设备当时并未配备环境舱，样品不可避免地在测试前及测试过程中暴露于不同的环境条件之下。
文件名：Hyperelastic_vs_Viscoelastic_Nonlin_Modelling.m
此为主处理MATLAB程序文件，通过非线性最小二乘曲线拟合方法计算应力。
文件名：funTestData_ShoulderTendon.m
该函数由上述文件调用，用于从Excel文件‘TestData.xlsx’中提取弹性区域内的测试数据。文件包含三次测试，每次测试的弹性区域上限各不相同。函数根据其参数调用每次的测试数据。
文件名：funyehmod.m
本MATLAB函数实现了Yeoh材料模型。
文件名：funstdnonlinsolid.m
此MATLAB函数通过S型核函数实现了标准非线性固体模型。