The aim of this research was to investigate the influences of different test methods on the transverse and longitudinal deformations of specimens and the introduction of the strip quadratic method for the determination of the Poisson's ratio. The research was conducted in two parts. In the first part strip biaxial and strip quadratic methods were investigated. Based on the test results the longitudinal and transverse deformations under tensile loading were analyzed, which resulted in a proposal for modifying the test method for determining the Poisson's ratio. In the second part the Poisson's ratios for five different fabrics were determined using a strip quadratic method. The analyses of the results showed that this test method influenced the values of longitudinal and transverse deformations for the test specimen and its constituents. The proposed tensile method, which is based on a square-shaped specimen, assures determination of the actual values for transverse deformation during the loading.
COBISS.SI-ID: 18626838
Studying the physiological responses of the human body within different environments and during different activities is very complex because the human body responds differently (physiologically and subjectively) to thermal environments. The human body responds to the microclimate between the skin and the clothing, resp. the clothing system, and any risk of heat strain will be a response to that climate. This contribution deals with the study of an atypical case of relationship between physiological responses of human body and the subjective assessments of thermal comfort under various environmental conditions. The investigation shows that the physiological responses of the human body, which are expressed as a function of thermophysiological performances of clothing during wearing, are reflected within subjective assessments of thermal comfort or discomfort
COBISS.SI-ID: 18871830
The sitting position is very common in everyday life and therefore any garment should be comfortable in that positon. It is especially important for those who are disabled and are confined to a sitting position throughout life. These include paraplegics whose restricted movements are due to paralysis of the lower limbs and restrict them to a wheelchair. Garments for a sitting position should meet certain particular needs like the body dimensions and postures of each individual. Design considerations should provide ergonomic comfort in a sitting position and include functional requirements due to limitations of strength and mobility in such a way that they do not cause additional health problems to paraplegics, e.g. skin irritations, pressure sores, obstruction of the blood flow etc., but rather to improve the quality of life for paraplegics. Today, the development of garments is practically impossible to imagine without the assistance of 3D CAD systems for the virtual prototyping of garments, which usually provide only the 3D body models in a standing position. The aim of this study was to explore the possibilities for the virtual prototyping of garments in regard to the sitting position, using the OptiTex 3D commercial CAD system. For this purpose 3D scans of subjects in sitting position were performed using a general-purpose ATOS II 3D optical scanning system. In addition, processing techniques of the human body mesh modeling and surface reconstruction techniques were involved to obtain a sitting 3D body model. The garments’ basic pattern designs for a standing position were constructed according to the rules of the M. Müller&Sohn construction system. Their reconstruction into garments’ basic pattern designs for a sitting position were performed by using the virtual measured dimensions of the scanned 3D body model in a sitting position, and virtual prototyping of the garments. Comparisons between the dimensions of the real and the 3D body models were carried out, as well as a comparison between the real sewn and virtually developed garments. The research showed that a reliable sitting 3D body model was achieved by used scanning technology, modeling and reconstruction techniques, as well as the usefulness and effectiveness of the virtual prototyping of the garments for a sitting position. In this study fully mobile individuals were involved to avoid unnecessary burdening of paraplegics in this stage of the research. The experiences gained from this study will enable us to include paraplegics within the study during the scanning and anthropometric survey with the aim of designing a general parametric 3D body model. Its body dimensions and postures would be possible for adapting from able-bodied persons with the purpose of developing individual garments for paraplegics.
COBISS.SI-ID: 18753046
The contribution presents a research into the impact of textile materials' parameters on behaviour and tension loads of virtual garments. Investigated was also the impact of sitting 3D body model postures and their complexity on virtual garment’s appearance in connection with garment pattern construction. After simulating basic sport shirt garment to different 3D body model postures, the highest tension and stretch deformations in x-direction appeared with fabric type S1, while the highest observed values in y-direction belonged to the fabric type S2. For both fabric types, the measured values increased by the 3D body model complexity where the garment’s fit appearance appeared less satisfactorily. By adjusting the sport shirt’s pattern construction, garments fit appearance has significantly improved at some areas. Observed were higher stretch and tension deformation values with fabric type S2 along any wave of the garment. Repeatedly, values of tension loads increased with the inclination of the 3D body model segments at the 3D body model, which posture was adapted to a wheelchair-racer.
COBISS.SI-ID: 19074070
Manufacturers today are using different textile materials for making clothes. Those materials can look the same, but in the same time, they can have significantly different characteristics. The material and its characteristics should allow clothes making that will meet the aesthetic, ergonomic and physiological requirements. Increase of the aesthetic value of clothing, nowadays, is often carried out with the process of printing. This paper presents the influence of parameters of digital printing, such as the number of passes and tone value, on thermo-physiological properties of different material composition. For research were used fabric made of 100% cotton fiber (100% CO), 100% polyester fibers (100% PES) and their mixture (50% CO / 50% PES). The influence of printing parameters on thermo-physiological properties of the material is evaluated through thermal resistance of textiles and textile resistance to the flow of water vapor as a parameter of a thermo-physiological comfort of clothing. The results showed that in addition to the process and printing parameters, a material composition also has a major influence on thermo-physiological properties of textile materials.
COBISS.SI-ID: 18916118