Many considerations are included in a valid engineering design process. Typically decisions that provide for safe service and expected reliability in the given component or structure are the most critical. Determining the numerical value of an appropriate safety factor (or factor of safety) during design is vital to achieving mechanical or structural integrity.
As "water hammer" (i.e. liquid impact) has the potential to cause glass bottle failure, Read Consulting LLC created two such failures to study the resulting fracture surface details.
A tornado can cause catastrophic and extensive damage to all types of structures. For some, the damage requires a total rebuild. However, for the homes and buildings that are salvaged after a tornado, a detailed assessment by a qualified structural engineer is needed to determine the extent of structural damage, the repairability of the structure, and to assist with other repair recommendations related to the building envelope and required building code upgrades.
Plaintiff was admitted to a health care facility with ventricular tachycardia (VT). He had a normal coronary angiography with moderate left ventricular (LV) function and was referred for an implantable cardiac defibrillator (ICD) implant procedure. A diagnosis of right ventricular outflow tract tachycardia was made. He was then admitted for an ablation procedure in March 2005, which was successful. In April 2005, he was readmitted with a further occurrence of tachycardia which required emergency cardio version due to hemodynamic compromise and a temporary pacing wire was placed. There was a further attempt at ablation that was again successful and the LV function noted now to have deteriorated and was noted as having poor functioning. On this basis he was considered a candidate for an ICD implant. There was a further reoccurrence of an episode of ventricular tachycardia (VT) in March and April 2006 which was treated medically and he was discharged.
Read Consulting was asked to determine why a welded chair failed and caused injury to the person sitting in it.
It is essential when beginning a root-cause failure analysis involving metallic materials to collect and maintain the as-found physical evidence properly prior to detailed examinations. This has two objectives. In all cases collecting and protecting the evidence in its undisturbed condition provides the best opportunity to derive meaningful good results from the subsequent analyses. Secondly, in a legal proceeding lack of attention to these matters can produce the accusation of spoilation of evidence. As a minimum this will cause presentation problems for the offending party in the suit. At worst such deficiencies by that party may cause the case to be thrown out.
Rail residual stress distributions can be complex and variable in nature, as different manufacturing techniques produce varying stress magnitudes and distributions. To evaluate the effect of residual stresses on rail integrity, an analysis technique was sought that could quantify the effect of these stresses on web crack propagation.
A significant number of elderly persons experience falls every year. In 2010, 2.3 million nonfatal fall injuries involving elderly people were treated in emergency rooms around the country. In the same year, 21,700 elderly people died as the result of unintentional falls. Falls for elderly people are extremely hazardous as they may not recover from fractures and other injuries.
The root cause of the failure of customer returns of heated automobile rear view mirrors was investigated.
A severe personal injury incident occurred as a recreational fishing boat was approaching a dock at approximately 20 mph after a day on the water. The large outboard engine (75 HP) on the stern of the boat struck a fixed underwater obstruction, flipped into the boat while still running and amputated the hand of a passenger seated near the engine.