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In parallel with technological developments, the need for affordable, functional and sustainable materials is increasing day by day. At this point, wood composite materials, which provide many economic and environmental advantages compared to traditional polymer matrix composites, attract great interest due to their functionality in a variety of engineering applications. In this study, the structural properties of functional wood plastic composites were examined before the sustainability analysis and the current market analysis was made by evaluating the usage areas of these materials Furthermore, information about these materials' production methods is presented, and approaches for improving material properties are evaluated. The literature review compiled integrated information on the recent progress of these composites and the development of material properties. Thus, by emphasizing the importance of wood-plastic composite materials in terms of sustainability, it is aimed to provide researchers with a basis for the structural properties, production technologies and sectoral trends of these materials. [ABSTRACT FROM AUTHOR]

Fatigue tests of materials require longer time than most other mechanical tests when the enitre process is considered. One of the most critical factors affecting the test time is the test frequency. In this study, fatigue tests at different test frequencies were applied to the PLA parts produced by the additive manufacturing (AM) technique, and the effects of test frequency were investigated. In the fatigue tests, four different stress levels were applied, and the tests were carried out at four different frequencies: 2 Hz, 4 Hz, 6 Hz, and 8 Hz. The fatigue life of the samples changed according to the applied stress levels at varying test frequencies. There was an approximately 44% decrease in the fatigue life with increasing test frequency at the 1st stress level. Fatigue life showed an increasing trend at and after the 3rd stress level. At the 4th stress level, fatigue life increased by 45% when the test frequency was changed from 2 Hz to 8 Hz. In general, after a specific fatigue life, it was observed that increasing test frequency tended to increase the fatigue life. [ABSTRACT FROM AUTHOR]

This compilation article extensively examines the role and impact of Polylactic Acid (PLA) material in products manufactured using Fused Deposition Modeling (FDM) method in additive manufacturing (AM). Presently, 3D printing technologies are rapidly proliferating across numerous industries and applications. Performance and impact in the FDM printing process can vary based on factors like; infill pattern, printing orientation, PLA's melting temperature, feed rate, and layer thickness. Infill patterns and printing orientation significantly affect the mechanical durability, surface quality, and printing duration of the product. Hence, the identification and optimization of suitable parameters are crucial for the effective utilization of PLA in 3D printing. This compilation gathers research from the existing literature regarding PLA's role and performance in the FDM printing process, encompassing PLA's structural and mechanical attributes, the influence of printing parameters and infill patterns, and the industrial applications of products manufactured using PLA. Specifically, the physical and chemical characteristics of PLA, optimization of printing parameters, geometry of infill patterns, printing orientation, and layer structure are examined. This study aims to provide a comprehensive reference regarding the characteristics and performance of PLA. It is intended to be a valuable resource for researchers, industry professionals, and academics engaged in the fields of design and engineering. [ABSTRACT FROM AUTHOR]