Total thumb reconstruction by an original groin pocket flap-graft design
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Background: The thumb plays a key role in hand function for precise dexterity. The surgical treatment of full avulsions of the digital skin sheath by tearing (ring syndrome) is complex and the management of these lesions is challenging for the reconstructive surgeon. When replantation is not possible, other alternatives are available if the covering tissue is thin and flexible. Case presentation: A 30-year-old male, tobacco addict, had a thumbsequelae similar to a stage III ring finger. Revascularization attempt failed and the skin envelope necrosed secondarily. A groin pocket flapgraft allowed a conservation of his thumb with a satisfactory aesthetic and functional result. Conclusions: We described a thumb coverage by a groin flapgraft using an original pocket design. This simple and safe procedure, in the carefully selected patient can successfully address functional and aesthetic concerns simultaneously, with minimal sequelae at the donor site. This technique can be used to treat a cutaneous tearing of the other fingers.Keywords:
Groin
Proximal phalanx
Tearing
Case presentation
Presentation (obstetrics)
The tearing mechanisms of woven fabrics are analyzed,conclusion can be drawn that the tearing strength is relatively steady and the size of the del won't alter significantly under single rip method while the tearing strength will increase gradually till go up to maximum as well as the size of the del will be bigger and bigger under trapezoid tearing method as the yarns brake one by one.Tearing strength tests of four fabrics have been done by using those two methods,the tearing curves show good agreement with the tearing mechanism we have deduced.At the same time we discuss the importance of 2D woven fabrics' mechanical properties to 2D textile composites.
Tearing
Textile
Woven fabric
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Hot tearing is often a major casting defect in magnesium alloys and has a significant impact on the quality of their casting products. Hot tearing of magnesium alloys is a complex solidification phenomenon which is still not fully understood, it is of great importance to investigate the hot tearing behaviour of magnesium alloys. This review attempts to summarize the investigations on hot tearing of magnesium alloys over the past decades. The hot tearing criteria including recently developed Kou's criterion are summarized and compared. The numeric simulation and assessing methods of hot tearing, factors influencing hot tearing, and hot tearing susceptibility (HTS) of magnesium alloys are discussed.
Tearing
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A criterion for the tearing of rubber based on an energy balance approach, proposed previously, has been critically examined experimentally. This criterion implies that the energy required to form unit area of surface by tearing should be a constant of the material, and it can be tested by finding if tearing results from test pieces of different shapes are selfconsistent. Previous work has indicated that the criterion is approximately correct for natural rubber, and the present paper gives a much more rigorous check for a noncrystallizing and therefore more convenient material (GR-S). The results from three test pieces of widely different shapes show excellent agreement. The material used exhibited an abrupt change in the mode of tearing as the tearing energy increased through 3 × 106 ergs/cm.2, the rate of tearing suddenly increasing from about 10−2 to 10 cm./sec. This correlated with a change in the appearance of the torn surfaces from rough to smooth.
Tearing
Constant (computer programming)
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Abstract In this paper, the tearing properties of a multi-axial warp knitted fabric produced with glass filaments and coated with PVC resin are presented. The typical tearing load-extension curves and influences of the different tearing testing conditions are analyzed. The results show that the tearing properties of the coated multi-axial warp fabric are different from those of the coated woven fabrics and that they depend on the tearing directions and tearing methods. The trapezoidal method and tearing tests along diagonal directions give higher resistance against tearing propagation.
Tearing
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Tearing
Aluminium foil
Base (topology)
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Abstract This paper focuses on developing an advanced test method and its use to study hot tearing defects in aluminium alloy castings. The paper consists of two parts. The first part introduces the reader to hot tearing in general, and provides theoretical analysis of the hot tearing phenomenon. The second part describes a newly developed method for assessing hot tearing susceptibility, and also gives the results on hot tearing for various aluminium alloys. During the test, the effect of alloy chemical composition on hot tearing susceptibility was analyzed. Three different Al-based alloys with varying Si, Cu and Ti contents were examined. Conclusions deal with the effect of individual elements on hot tearing susceptibility, and confirm that the main objective was achieved and the proposed method proves to be repeatable and reliable.
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We present here an analysis of the stages of static tearing in cotton fabrics for wing-shaped test specimens. For the analysis and measurements of geometry of the tearing zone, a program for image analysis was realized and video film elaborated. Moreover, the influence of the constructional features of woven fabrics and fabric structure, and also the testing conditions on the tear force and tearing zone parameters were examined.
Tearing
Woven fabric
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We have tested the tearing strengths of eight different woven fabrics by means of single tongue method and trapezoid method. We have also studied the tearing mechanism and test results of these methods, by rank testing and dual linear regressing the maximum tearing strength, average tearing force, and mean value of five-peak. It shows that the two methods have good linear correlation, despit of their different tearing mechanisms and states.
Tearing
Linear correlation
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In this paper, Tearing strength of the twelve kinds of Coated fabrics with different specifications were measured by using four different tearing methods. The relationships among tearing strength tested by different tearing methods were obtained. Moreover, the influences of coating processing on tearing strength and tearing failure mechanism were studied, and a mechanical model expressing trapezoid tear strength of coated fabrics is also proposed. The experimental results showed that the mechanical model could be used to predict trapezoid tear strength of coated fabrics with certain precision.
Tearing
Tear resistance
Failure mechanism
Mechanical strength
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This paper deals with the tearing analysis on laminated fabrics used in pneumatic structures (specifically crack propagation and tearing strength). Uniaxial tearing tests were carefully conducted on specimens, and the influences of crack parameters on the tearing behaviors and strength of a laminated fabric were discussed. Afterward, the biaxial tearing tests were performed on the cruciform specimens to study their central tearing properties. The tearing strength and failure performance were significantly related to the stress ratios. With the same equivalent crack length, the samples under biaxial loads could show a higher tearing resistance than those under the uniaxial loads. Finally, the results of three different theories used to predict the uniaxial tearing strength were compared with the experimental results, and it was found that the Thiele theory provided the best prediction for the tearing strength of laminated fabrics.
Tearing
Uniaxial tension
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Citations (46)