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The automobile industry has shown an increased interest in the use of composite leaf springs due to their high strength to weight ratio. The introduction of composite materials has made it possible to reduce the weight of the leaf spring without any reduction in load carrying capacity and stiffness. In this paper, the results of research on fatigue life of composite (Glass Fiber Reinforced plastic – GFRP) leaf springs are presented. Composite springs were designed in such a way that they could replace steel springs in a van.

There are many known bone stabilization systems. New implant systems are finding to fixation of bone multifractures. One of such stabilization system is analyzed in this article. This article is focused on the material research of the elements of the innovative system designed to fixation of multisite bone fractures. The components are manufactured by means of the selective laser melting (SLM) 3D printing technology (3DPT). Their chemical composition, as well as the surface and internal structure of small‐sized elements, is tested. The influence of heat treatment on the internal structure and, consequently, strength is investigated. Herein, novel bone fracture fixation implants made of titanium alloy (Ti–6Al–4V) manufactured through SLM 3DPT are investigated. The microstructures of the main components of the new modular implant fixation system are assessed, as well as hardness distribution and morphology of the fractures induced in tension and bending. It is found that the implant elements assessed are free from harmful chemicals, and the structures obtained exhibit high strength and present a porous surface that is suitable for osseointegration promotion. In summary, the fabricated titanium implants are expected to be adequate for the treatment of bone fractures.

The paper presents an analysis of the stress state in a sandwich open conical shells during of stability loss. The shells under consideration consist of a lightweight core layer and two face-layers which are load-carrying. The thickness of those faces is assumed to be equal, and the thickness of the core is about 80% of the whole shell thickness. The load carrying faces are made of isotropic, compressible, work-hardening materials. The core layer is assumed to be elastic, incompressible in the normal z direction and it resists transverse shear only. The shell under consideration is loaded by lateral pressure and longitudinal force. Deformation of the shells within the plastic range is possible before buckling. In order to determine the stress state which occurs during stability loss, the stability equations have to be derived. With respect to this research, the constitutive relations of the Nadai-Hencky deformation theory, alongside the HMH (Huber-Mises-Hencky) yield condition, are accepted in the analysis.

In the paper the D3 discipline of the G8D method has been presented. In the presented procedure all decisions are made regarding the introduction of interim corrective actions - ICA. The algorithm of conduct for the discipline and the quality management tools that the discipline uses have been also presented. It has been also discusses how to proceed for the D3 discipline in determining temporary corrective actions for the NOK detail with the preceding actions in the D2 discipline.