Performance of concrete patch repair systems

2007 ◽  
pp. 255-262 ◽  
Author(s):  
Hans-Dieter Beushausen ◽  
Mark Gavin Alexander
Keyword(s):  
Patch Repair ◽  
Repair Systems

Drying shrinkage stresses in concrete patch repair systems

1997 ◽  
Vol 49 (181) ◽  
pp. 283-293 ◽  
Author(s):  
M. Asad ◽  
M. H. Baluch ◽  
A. H. AI-Gadhib
Keyword(s):  
Drying Shrinkage ◽  
Patch Repair ◽  
Repair Systems

AN ANALYSIS ON THE MEASUREMENT OF THE YOUNG MODULUS FOR COMPOSITE MATERIALS AND ITS EFFECT ON PIPE REPAIR SYSTEMS

2019 ◽  
Author(s):  
Camila Ranucci de Luca ◽  
João Fellipe Souza ◽  
Paulo Torres ◽  
Heraldo da Costa Mattos
Keyword(s):  
Composite Materials ◽  
Young Modulus ◽  
Repair Systems

FACTORS INFLUENCING THE OPERATION TECHNIQUE OF PEFORATED DUODENAL ULCER REPAIR BY SINGLEPORT LAPAROSCOPIC SURGERY

2016 ◽  
pp. 99-105
Author(s):  
Huu Tri Nguyen ◽  
Loc Le ◽  
Doàn Van Phu Nguyen ◽  
Nhu Thanh Dang ◽  
Thanh Phuc Nguyen
Keyword(s):  
Duodenal Ulcer ◽  
Laparoscopic Surgery ◽  
Correlation Coefficient ◽  
Open Surgery ◽  
Operative Time ◽  
Single Port ◽  
Time Correlation ◽  
Patch Repair ◽  
Perforated Duodenal Ulcer ◽  
Conversion To Open Surgery

Background: Single-port laparoscopic surgery (SPLS) is increasingly used in surgery and in the treatment of perforated duodenal ulcer. The aim of this study was to evaluate technical factors for perforated duodenal ulcer repair by SPLS. Methods: A prospective study on 42 consecutive patients diagnosed with perforated duodenal ulcer and treated with SPLS at Hue university of medicine and pharmacy hospital and Hue central hospital from January 2012 to February 2015. Results: The mean age was 48.1 ± 14.2 (17 - 79) years. 40 patients were treated with suture of the perforation by pure SPLS. There was one case (2.4%) in which one additional trocar was required. Conversion to open surgery was necessary in one patient (2.4%) in which the perforation was situated on the posterior duodenal wall. Two patients (4.8%) with history of abdominal surgery were successfully treated by pure SPLS. The size of perforation was correlated with suturing time (correlation coefficient r = 0.459) and operative time (correlation coefficient r = 0.528). Considering suture type, X stitches were used in 95.5% cases, simple stitches were used in one case (2.4%) while Graham patch repair technique was utilized in one case (2.4%) with large perforation. Most cases (95.1%) required only simple suture without omental patch. Peritoneal drainage was spared in most cases (90.2%). Conclusions: SPLS is a safe method for the treatment of perforated duodenal ulcer. Posterior duodenal location is the main cause of conversion to open surgery. Factor related to operative time is perforation size. Key words: perforated duodenal ulcer, single port laparoscopic repair, single port laparoscopy

Design of Pipeline Composite Repairs: From Lab Scale Tests to FEA and Full Scale Testing

2014 ◽  
Author(s):  
Remy Her ◽  
Jacques Renard ◽  
Vincent Gaffard ◽  
Yves Favry ◽  
Paul Wiet
Keyword(s):  
Finite Element ◽  
Full Scale ◽  
Combined Loading ◽  
Material Strength ◽  
Repair System ◽  
Loading Conditions ◽  
Original Design ◽  
Composite Repair ◽  
Repair Systems ◽  
Composite Properties

Composite repair systems are used for many years to restore locally the pipe strength where it has been affected by damage such as wall thickness reduction due to corrosion, dent, lamination or cracks. Composite repair systems are commonly qualified, designed and installed according to ASME PCC2 code or ISO 24817 standard requirements. In both of these codes, the Maximum Allowable Working Pressure (MAWP) of the damaged section must be determined to design the composite repair. To do so, codes such as ASME B31G for example for corrosion, are used. The composite repair systems is designed to “bridge the gap” between the MAWP of the damaged pipe and the original design pressure. The main weakness of available approaches is their applicability to combined loading conditions and various types of defects. The objective of this work is to set-up a “universal” methodology to design the composite repair by finite element calculations with directly taking into consideration the loading conditions and the influence of the defect on pipe strength (whatever its geometry and type). First a program of mechanical tests is defined to allow determining all the composite properties necessary to run the finite elements calculations. It consists in compression and tensile tests in various directions to account for the composite anisotropy and of Arcan tests to determine steel to composite interface behaviors in tension and shear. In parallel, a full scale burst test is performed on a repaired pipe section where a local wall thinning is previously machined. For this test, the composite repair was designed according to ISO 24817. Then, a finite element model integrating damaged pipe and composite repair system is built. It allowed simulating the test, comparing the results with experiments and validating damage models implemented to capture the various possible types of failures. In addition, sensitivity analysis considering composite properties variations evidenced by experiments are run. The composite behavior considered in this study is not time dependent. No degradation of the composite material strength due to ageing is taking into account. The roadmap for the next steps of this work is to clearly identify the ageing mechanisms, to perform tests in relevant conditions and to introduce ageing effects in the design process (and in particular in the composite constitutive laws).

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