scholarly journals Failure analysis and repair of the telescopic beam belonging to the spreader of a reach stacker for port operations

2020 ◽  
Vol 25 (1) ◽  
pp. 30-36
Author(s):  
Edgardo Manuel Buelvas Castro ◽  
Fabio Andres Bermejo Altamar ◽  
Ricardo Andrés Mendoza Quiroga
Keyword(s):  
Failure Analysis ◽  
Working Hours ◽  
Metallographic Analysis ◽  
Hardness Profile ◽  
Fracture Area ◽  
Repair Procedure ◽  
Manufacturer Brand ◽  
Welding Procedure ◽  
Type Of Failure ◽  
Excess Load

Reach stackers land equipment operating in ports of the Colombian Caribbean, are subject to several critical working conditions such as; corrosive environment, excess working hours, overload and lack of predictive maintenance. This work focuses on the failure analysis and the elaboration of the welding repair procedure of the telescopic beam belonging to the spreader of a Reach stacker that operates in a Colombian Caribbean seaport. Initially the fault zone was characterized; by mean a metallographic analysis and a hardness profile to identify the type of structural steel of which the beam is composed, obtaining an A514 grade C of 110KSI of tensile strength and 34HRC of hardness. The equipment manufacturer was verified and the established by the laboratory tests was corroborated. After identifying the material, the fracture area was analyzed where patterns of beach markings were found, typical of a fatigue failure which extended from the circumference of separating pins to the surface of the beam. The inclusion of the separators in the initial design generates stress concentrators in the welding of the pins which increases the fatigue zone combined with the excess load with which the equipment works. This fact could be verified with a technical bulletin published by the manufacturer brand "Taylor" where it indicates this type of failure for the telescopic beam of the Reach stackers. Successively, an FCAW type welding repair procedure is developed in accordance with AWS code D1.1, where the electrode to be used, the cords to be applied, the preheating, and the speeds and conditions recommended for filling the materials are selected cracks.  Finally it could be concluded that the fault was generated by fatigue and overload in the welding of the telescopic beam separator pins and its repair will be carried out according to a welding procedure of the AWS code D1.1. The analysis of these types of cases will allow the company to take actions to minimize the new occurrence of the failure such as periodic reviews in that area after the work hours recommended by the manufacturer and the awareness of the equipment operators with the handling of loads on the dock.

Application of Ground Penetrating Radar to Rock Failure Analysis in High Risk Tunnels

2010 ◽  
Vol 34-35 ◽  
pp. 1661-1665 ◽  
Author(s):  
Le Wen Zhang ◽  
Huai Feng Sun ◽  
Shu Cai Li ◽  
Dao Hong Qiu ◽  
De Yong Zhang
Keyword(s):  
High Risk ◽  
Failure Analysis ◽  
Ground Penetrating Radar ◽  
Rock Failure ◽  
High Geostress ◽  
Fracture Distribution ◽  
Ground Penetrating ◽  
Type Of Failure

The authors found a type of sidewall failure during the construction of a tunnel with high geostress. And relative strong rockburst usually occurred in the areas nearby during the excavation. This paper shows this type of failure called Crisp Fissure Failure and some characteristics of the failure. Reasons of the failure are also discussed. Further more, the authors studied the fracture distribution under this type of failure by Ground Penetrating Radar. Suggestions of support in a high risk tunnel are put forward based on the research of the Crisp Fissure Failure.

Gas Pipeline Failure Caused by In-Service Welding

2015 ◽  
Vol 138 (1) ◽  
Author(s):  
A. Farzadi
Keyword(s):  
Failure Analysis ◽  
Gas Pipeline ◽  
Operating Conditions ◽  
Pipe Material ◽  
Natural Gas Pipeline ◽  
Repair Operation ◽  
Repair Procedure ◽  
Hydrogen Assisted Cracking ◽  
Major Factors ◽  
Material Information

In the research presented in this paper, a failure analysis had been carried out to identify causes of an incident, which had taken place after an operation to repair a leak in an interstate natural gas pipeline. In this operation, a partial encirclement reinforcement (patch) was welded to the carrier pipe according to an available hot taping procedure, while gas was flowing in the pipeline. The failure analysis commenced with preliminary steps of information gathering of background data regarding the repair operation and then several samples were extracted for macroscopic and microscopic metallurgical examinations. In addition to fractographic analyses of fracture surfaces, pipe material was examined because the pipeline had been in service for prolonged period and there was not any official material information available. The analyses disclose that hydrogen-assisted cracking, wrong design of branch connection, paint coating, and pipeline operating conditions were major factors contributing to the failure. The work undertaken also included development and recommendation of a repair procedure to avoid similar failures in the future.

Failure Analysis of a Metallic Component Used in Hospital Cooling Equipment

2015 ◽  
Vol 638 ◽  
pp. 310-315
Author(s):  
George Coman ◽  
Sorin Ciuca ◽  
Mirela Sohaciu ◽  
Ecaterina Matei ◽  
Andra Predescu ◽  
...  
Keyword(s):  
Failure Analysis ◽  
Microstructural Analysis ◽  
Optical Emission ◽  
Emission Spectrometry ◽  
Metallographic Analysis ◽  
Metallic Component ◽  
Metallic Material ◽  
X Ray ◽  
Made In

The paper presents the investigations made on samples taken from the related rotor blade of an hospital cooling equipment.The failure analysis was made in order to find if the failure appear because the metallic material used or was functional problem.The objectives of our analysis and techniques used are described below:determining the chemical composition by optical emission spectrometry;determining the hardness of the material;metallographic analysis by optical microscopy;micro compositional and microstructural analysis by scanning electron microscopy (SEM) and by microanalysis, energy dispersive X-ray (EDAX). Research has highlighted the quality of piece elaboration and casting, which led to a long life of its use.

scholarly journals Failure analysis of radial bearings used in the refining of petroleum products

2019 ◽  
Vol 121 ◽  
pp. 03003 ◽  
Author(s):  
Mark Kovalev ◽  
Daniil Lyashenko ◽  
Maksim Kurakin ◽  
Aleksey Shakhmatov
Keyword(s):  
Failure Analysis ◽  
Petroleum Products ◽  
Common Type ◽  
Operating Conditions ◽  
Frequent Occurrence ◽  
Screw Compressor ◽  
Premature Failure ◽  
The Future ◽  
Type Of Failure ◽  
Special Case

The problem of premature failure of bearings is a common type of failure. In most cases, the destruction occurs due to violation of operating conditions. Since the destruction of bearings is a frequent occurrence, consideration of this special case of destruction in the future will help to avoid such problems. The object of research is the screw compressor bearings destroyed during operation. To identify the causes, a collapsed bearing was examined and a bearing that did not collapse during operation.

Advanced Electrical Characterization of 90 nm Soft Bit Failure by Nano Probing Technique

2005 ◽  
Author(s):  
Christelle Giret ◽  
Damien Faure
Keyword(s):  
Failure Analysis ◽  
Electrical Characterization ◽  
Physical Analysis ◽  
Electrical Measurements ◽  
Device Failure ◽  
Sram Cell ◽  
Visual Defects ◽  
Difficult Challenge ◽  
Type Of Failure

Abstract The Soft Bit failure (Single Bit Failure sensitive to voltage) of a 90nm SRAM cell presented a difficult challenge for the Failure Analysis (FA) group. Physical analysis of these Soft SRAM failures did not show any visual defects; therefore the FA required an accurate electrical characterization. The transistor characteristics of the failing SRAM transistors are needed in order to speculate on the possible failure mechanism. The Nano-Probing technique performed at Nice Device Failure Analysis of Laboratory (NDAL) allowed us to identify anomalies of I/V characteristics like Vt imbalance, low Gain, asymmetrical Vt, ID (Drive current) and Ron. Case studies of an asymmetry phenomenon reported here lead to a correlation between the failure mode and the electrical measurements. This paper demonstrates a suitable electrical methodology and characterization by Nano-Probing in order to successfully manage a FA approach on this type of failure.

scholarly journals Finite Element Simulation of Acceleration Pedal On XX Vehicle

2019 ◽  
Vol 4 (2) ◽  
pp. 45
Author(s):  
Nanang Ali Sutisna ◽  
Aldhito Hardianto
Keyword(s):  
Finite Element ◽  
Failure Analysis ◽  
Product Design ◽  
Test Method ◽  
Product Reliability ◽  
Element Simulation ◽  
Cause Of Failure ◽  
Type Of Failure ◽  
Best Parameters ◽  
Failure Types

<p>This paper presents the failure analysis of acceleration pedal of xx vehicle. The purpose of this research are to know the cause of failure, types of failure, and approach in searching for the best parameters that yield optimal product quality on product design. This research uses the known test method, where the type of failure and results of analysis compared with the result of expected product reliability. The simulation uses CATIA V5 software involving types of load that applied on product, length, size and dimension of product, and types of material. Simulation result data is used for see the influence and effect of each parameter to the product design, also the types of failure that will affect the product reliability</p>

The Failure Analysis Process

2012 ◽  
pp. 549-583
Keyword(s):  
Chemical Analysis ◽  
Failure Analysis ◽  
Mechanical Testing ◽  
Metallographic Analysis ◽  
Fracture Surfaces ◽  
Service Testing ◽  
Analysis Process

Abstract This chapters discusses the basic steps in the failure analysis process. It covers examination procedures, selection and preservation of fracture surfaces, macro and microfractography, metallographic analysis, mechanical testing, chemical analysis, and simulated service testing.

Fluorosilicate Glass (FSG) Outgassing Induced Aluminum Bond Pad Corrosion during Post-Fab Wafer Storage

2012 ◽  
Author(s):  
Hua Younan ◽  
Nistala Ramesh Rao ◽  
Chen Shuting
Keyword(s):  
Failure Analysis ◽  
Failure Mode ◽  
Subsequent Removal ◽  
Left Behind ◽  
Gas Chemistry ◽  
Type Of Failure

Abstract A case study of Fluorine (F)-outgassing is presented in this paper that caused the corrosion of Aluminum bond pad. It will be shown that the source of F-contamination is not the typical residue left behind after the passivation etch with Fluorine-based gas chemistry and the subsequent removal of the etch polymer generated with solvent (chemical) clean. Rather, it is introduced as a result of F-outgas over a period of time from the intermetallic dielectric (IMD) film, fluorosilicate glass (FSG), during the post-fab wafer storage. The methodology used in our failure analysis (FA) lab to identify and characterize this type of failure mode is presented in the paper.

scholarly journals Failure Analysis and Repair of a Broken Extruder Shaft

2020 ◽  
Vol 5 (1) ◽  
pp. 107-111
Author(s):  
Salem Ali Karrab ◽  
Mohamed Ali Ballem
Keyword(s):  
Failure Analysis ◽  
Repair Process ◽  
Fracture Face ◽  
Screw Extruder ◽  
Visual Examination ◽  
Twin Screw ◽  
Repair Procedure ◽  
Recorded Data ◽  
Precautionary Measures ◽  
Welding Technique

In this paper a failure analysis of a screw shaft used in a co-rotating intermeshing twin-screw extruder was carried out; furthermore a detailed description for the repair procedure of the fractured part was presented. By means of the preliminary analyses of the failed shaft which includes a visual examination, appearance of fracture face, and photographic documentation of the fractured surfaces, and by summarizing and analyzing all relevant data it was possible to determine that the combination of torsion and bending forces was the cause of the failure. The shaft fractured with evidences of fatigue failure. Repairing of the fractured shaft was mainly performed by welding technique followed by suitable heat treatments and appropriate inspection methods. After repair process is completed, the extruder was put back into service, the recorded data during the trial and regular operations were satisfactory and within the design limits. Finally, in order to avoid future accidents and to prevent such problems in similar equipment, precautionary measures and recommendations were proposed.

Nondestructive Analysis Solution Using Combination of Lock-In Thermography (LIT) and 3D Oblique X-Ray CT Technology

2013 ◽  
Author(s):  
Naoki Seimiya ◽  
Takuhei Watanabe ◽  
Takashi Ichinomiya
Keyword(s):  
High Resolution ◽  
Failure Analysis ◽  
Analysis Method ◽  
Nondestructive Analysis ◽  
X Ray ◽  
Ct Technology ◽  
Total Analysis ◽  
Lock In ◽  
Type Of Failure ◽  
Non Destructive

Abstract We developed the non-destructive failure analysis method that is combination of Lock-in thermography (LIT) and high resolution 3D oblique CT. It made possible to complete the total analysis efficiently, because we can distinguish the type of failure by this non-destructive method.

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