Stress Analysis and Evaluation of High Pressure Hub

2011 ◽  
Author(s):  
Wang Liquan ◽  
An Shaojun ◽  
Zhao Yanan ◽  
An Yongdong
Keyword(s):  
High Pressure ◽  
Stress Analysis ◽  
Analysis And Evaluation

Stress Analysis and Strength Checking for High Pressure Gas Pipeline in the Earthquake Rupture Area

2013 ◽  
Vol 470 ◽  
pp. 866-870
Author(s):  
Wei He ◽  
Yan Dong Liu ◽  
Guo Xing Wang
Keyword(s):  
Finite Element ◽  
High Pressure ◽  
Stress Analysis ◽  
Gas Pipeline ◽  
Earthquake Rupture ◽  
Rupture Area ◽  
Pipeline Crossing ◽  
The Way

Based on the actual project example of high pressure gas pipeline crossing earthquake rupture area, the paper shows and explains the way to make stress analysis and strength checking calculation for the high pressure gas pipeline in the earthquake rupture area by the method of finite element.

Mechanical Stress Analysis and Evaluation of Hybrid Land Grid Array Attached Large Form Factor Organic Modules

2012 ◽  
Vol 2012 (1) ◽  
pp. 000818-000824
Author(s):  
John Torok ◽  
Shawn Canfield ◽  
Yuet-Ying Yu ◽  
Jiantao Zheng
Keyword(s):  
Form Factor ◽  
Stress Analysis ◽  
Mechanical Stress ◽  
Printed Circuit Board ◽  
Organic Substrate ◽  
Circuit Board ◽  
Bottom Surface ◽  
Mechanical Shock ◽  
Analysis And Evaluation ◽  
Pcb Assembly

Recent industry trends to continue enabling increased server system performance and packaging density has driven the need to implement larger form factor hybrid land grid array (LGA) attached organic modules. In addition, given the need to package multiple modules on a single printed circuit board (PCB) assembly, PCB cross-sections and their corresponding physical properties (e.g., flatness, etc.) as well as module bottom surface metallurgy (BSM) co-planarity require a more detailed understanding of impacts to the compliant as well as the soldered connector interfaces. Lastly, the migration to lead (Pb)-free solders has further complicated the issue given both the change in material properties as well as processing temperatures. In this paper we will discuss the mechanical stress analysis and evaluation tests assessment of a recently developed 50 mm square organic processor module, hybrid LGA attached to a multiple site PCB. The analysis presented will highlight the methodology to identify both connector soldered stress and predicted contact load variation across the module's mated interface. Key parameters discuss will include the PCB flatness, Organic substrate BSM co-planarity (both predicted and measured) and the Hybrid LGA as-soldered contact co-planarity. Corroborating predicted analytical results, we will discuss various evaluation tests performed to validate the design's integrity. Key tests include, pressure sensitive film (PSF) studies and environment stress exposures, including thermal shock, mechanical shock and vibration and seismic exposure. Post test electrical integrity and test sample construction analysis, including 3D x-ray and mechanical cross-section, will also be described. The analysis process and testing described will provide a method to evaluate more challenging hybrid LGA applications as both module sizes and/or number applied per PCB assembly increase and Pb-free assembly is introduced in future applications.

Geotechnical Instrumentation: Monitoring Longitudinal Stress of a High Pressure Pipeline During Longwall Mining Operations — A Case Study in West Virginia

2016 ◽  
Author(s):  
Martin P. Derby ◽  
Mark D. Saunders ◽  
Benjamin Zand
Keyword(s):  
High Pressure ◽  
West Virginia ◽  
Stress Analysis ◽  
Longwall Mining ◽  
Monitoring Program ◽  
Solar Array ◽  
Strain Gages ◽  
Mining Operations ◽  
Strain Monitoring ◽  
Implementation Program

Longwall mining operations could compromise the integrity of high pressure pipelines by way of surface subsidence and soil strains. Prior to implementing field programs for monitoring subsidence, a preliminary mitigation/stress analysis study should be designed to determine the possible effects of the longwall mining operations on the pipeline(s). If the stress analysis indicates possible high stresses beyond the allowable limits of a pipeline, then a mitigation plan should be developed and implemented. Regardless of the anticipated stress level in a pipeline, a strain monitoring program is usually recommended. The purpose of this paper is to discuss the design of a pipeline strain monitoring program, which includes the installation of strain gages at critical locations along two adjacent pipelines. The study area includes a 12 inch diameter steel pipeline (for natural gas transport) and a 12 inch HDPE pipeline for water transport. The study area is located in a mountainous region of West Virginia. Prior to the field program, a laboratory pilot study was performed with strain gages on a test section of HDPE pipe to determine the best mounting procedures. The field implementation program included the installation of strain gages on the gas and water pipelines. Multiplexers, data loggers, a solar array and a satellite modem for 24/7 data transfer were installed, and monitored throughout the study. During the field implementation program several meteorological and geologic events occurred which caused some design changes in the field program.

The Stress Analysis of the Industrial Fiber-Reinforced Concrete Slab on Elastic Subgrade Loaded by the Operational Loading

2014 ◽  
Vol 617 ◽  
pp. 46-49 ◽  
Author(s):  
Ján Kortiš
Keyword(s):  
Numerical Simulation ◽  
Stress Analysis ◽  
Concrete Slab ◽  
Fiber Reinforced Concrete ◽  
Heavy Vehicles ◽  
Reinforced Concrete Slab ◽  
Analysis And Evaluation ◽  
Different Characteristics ◽  
Different Thickness ◽  
Factory Building

Floors which are used for factory building are usually located in an environment where is expected to be used heavy vehicles and also heavy supplies stored on the floor. What means that these structures have to be designed to withstand the action of the forces. For that reason it is useful to do a numerical simulation followed by stress analysis and evaluation of results. The parametric study was done to compare the influence of different thickness and different characteristics of the subgrade on the values of stress in a concrete slab. It was loaded by forklifts and structures used for storage of material and products.

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