The deliverable reports the mechanical experiments and multi-photon microscopy imaging methods used to obtain the mechanical parameters and microstructural information of the ascending aorta and the pulmonary artery (main, left and right pulmonary artery) from healthy sheep, porcine and human tissue. In particular, the test set-up, the test protocol and the test samples are described for the biaxial extension test and the test protocol of the multi-photon microscopy method is detailed. Subsequently, the test results are presented. Lastly, based on the simplified vessel model (Deliverable 8.3 - Constitutive vessel model (TUG, M20)), an optimisation method is described to identify the constitutive parameters based on experimental data obtained from the literature and our laboratory.SIMCor (In-Silico testing and validation of Cardiovascular IMplantable devices) has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No 101017578.