Berkeley Engineering And Research, Inc.
Plures Intelligens Modicum Machinatorem
Telephone: 510-549-3300 
Fax: 510-962-8230 

BEAR Project Receives Award

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BEAR wins Best Paper of the Year

BEAR paper on preventing gasoline can explosions wins Best Paper of the Year

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Alcohol Containers Explode Too!

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Finite Element Analysis for Stress

 

.BEAR possesses the Finite Element (FE) capability to analyze large, complex, multi-body impact and dynamic problems in three dimensions. Our signature FE and 3-D Analysis include images and digital video, eliminating the added expense of animation. As part of our FE and 3-D packages, we provide analysis, results and graphic representations in the form of photo-quality prints or computer video files at no additional cost. Images are formatted for viewing on all personal computers (Mac and PC). With high resolution, they also project well in courtroom settings using a standard digital projector.

 

BEAR performs all levels of structural integrity assessment – including short notice, rush jobs requiring rapid results. Our clients include Chevron, TOSCO, BP, ARCO, Golden Gate Bridge District, A/C Transit and many other prominent commercial and non-profit entities at home in the United States and abroad.

   
 

Hellicopter Rocker Arm

 

As an example of our specialization, we performed a detailed contact analysis of the sleeve assembly of the rocker arm of a helicopter engine. Our FE (finite element) Analysis demonstrated the sleeve generated high stresses at the point of contact due to both bolting and system loads.

   
 

Buried Pipe

 

Another recent analysis involved a pipe buried within a plastic pipe. The buried pipe was subject to the repeated dynamic loads of a water hammer. Our 3-D model reveals how spacers between the pipes concentrated stresses in the outer pipe near areas of connection. Our model also examined the soil surrounding the pipe and its effective stiffness as part of or analysis model.

 

 

 

Piping Connection Analysis

 
Stress Analysis

The FE Analysis (at left) reveals the transition section of a 300-foot stack, 12-feet in diameter. This study included an examination of heat treatment of the welds combined with wind loading. We offer on-site strain gauge and thermal couple testing to more accurately assess load conditions. And in our Berkeley, Calif. full-service laboratory, we determine material fracture and fatigue properties.

 

Offshore Platforms

  large structure

BEAR engineers regularly perform fracture assessments for offshore platforms. These include locations in U.S. waters as well as the North Sea, Caribbean and Gulf of Mexico, including areas vulnerable to the negative impact of hurricanes. Our team, for example, inspected, laser-scanned and analyzed the Unimar platform (for deformations) after Hurricane Katrina wrecked havoc in 2005.

 

Amusement Parks

  Amusement Parks

BEAR has experience performing fatigue and fracture analyses on a wide variety of devices, such as this water slide space frame in Concord, California. Our computer-generated Finite Element Analysis of the water slide appears in the model shown here.

 

Playgrounds

  Playground

 

Ten percent of playground accidents are due to fighting among visitors, a recent NIH study showed. A much larger percentage of playground accidents, however, result from unforeseen equipment failure involving swings, slides, climbing frames, metal bars, merry-go-rounds. Slides and rope-plank swings are frequently involved in injuries and backward falls. Sometimes the results are dire. Playground accidents frequently lead to fractures of the extremities or concussion of the brain. To help prevent these accidents and determine the causes of failure, the BEAR engineering team employs various methodologies to analyze playgrounds.

 

Aircraft Engine Components

  asd

The connecting rod shown here, for example, was analyzed for stress concentrations in the connecting rod and bolts used to hold it together. BEAR performed a parametric study of bolt pre-loads using finite element analysis to determine the necessary bolt pre-load. Our goal was to reduce stress below a critical level. Our results determines the cause of failure and new pre-load specifications to prevent future failures.