### Destroying a large steel plate used in valuable engineering

Assignment Help Civil Engineering
##### Reference no: EM131069764

A disgruntled employee in an engineering company is intent on destroying a large steel plate used in a valuable engineering component. One evening, after the normal working hours, he cuts a very sharp notch in the edge of the plate. He orients the sharp flaw normal to the direction in which tensile stresses are applied to the plate, with the hope that the flaw would eventually result in catastrophic fracture of the plate. As he is committing the crime, a bystander telephones the plant foreman at the foreman&#39;s home. The fore-man, who leaves his home two minutes after the notification is received, travels to the scene of crime on his bicycle at an average speed of 15 km/hr. Would he have reached the plant in time to shut off the equipment before the plate fractures catastrophically? Here are some useful data for your analysis:

(i) The plate is cyclically loaded uniformly from 5 to 85 kN at a frequency of 75 Hz.

(ii) The plate is 18 cm wide and 0.5 cm thick,

(iii) The yield strength of the steel is 1250 MPa and the plane strain fracture tough ness is 48 MPa

(iv) The flaw introduced by the employee is 1 cm in length, through the thickness of the plate,

(v) The bystander, who notified the foreman, reported to the police, by phone, that, in his judgement, the crack in the plate was propagating at a velocity proportional to the crack tip opening displacement corresponding to the peak load of each cycle,

(vi) Post-failure fractographic examination revealed the presence of fatigue striations with a mean spacing of 2.5xlO~4 mm where the crack was 2.5 mm long,

(vii) The distance from the foreman&#39;s home to the factory is 5 km.

(viii) The time interval between the two phone calls was 10 minutes. State all your assumptions clearly

#### Questions Cloud

 Compute the magnitude of the pressure : Compute the magnitude of the pressure at which the cylinder burst. What are equilibrium wage rate and number of hours worked : What are the equilibrium wage rate and number of hours worked? What is the quantity of unemployment at the equilibrium wage? How many hours do teenagers work and how many hours are unemployed? Evaluate environment of small and medium sized enterprises : Demonstrate understanding of the psychology and philosophy of entrepreneurs and small medium business operators and critically evaluate the environment of Small and Medium sized enterprises Climbing the corporate ladder to ceo of pepsico : PepsiCo was ranked 63rd in the 2007 Fortune 500 list of the largest companies (ranked by revenues) and is number 1 in the Food and Consumer Products category (ahead of Kraft Foods, Sara Lee, Conagra Foods, and General Mills). Destroying a large steel plate used in valuable engineering : The bystander, who notified the foreman, reported to the police, by phone, that, in his judgement, the crack in the plate was propagating at a velocity proportional to the crack tip opening displacement corresponding to the peak load of each cycle.. Communication at navistar international : The decision to dedicate the resources needed to fund and support the Department of Communications within Navistar International sends a signal that corporate communication is seen as vital to the health of this \$12 billion truck and engine manufa.. The importance of social media and web analytics : Examine both the social media tools that will provide the highest return on investment (ROI), and two (2) key performance indicators (KPIs) that one could use to measure success. Lawrence weinbach-from unisys corporation : This is a case about a rising-star leader who flew for a while, but fell. Unisys Corporation has been in business for more than 130 years. Unisys contributed to the computer revolution with the first commercial large-scale system, its 29,000-pound.. Length of the goods train : A goods train runs at the speed of 72 kmph and crosses a 250 m long platform in 26 seconds. What is the length of the goods train?

### Write a Review

#### Determine the gage pressure in the water tank a

A manometer connects a large water tank open to the atmosphere to a closed spherical tank of air. The manometer contains both oil and water. Find the gage pressure in the tank "A".

#### Estimate length of pipeline required for the friction losses

Water leaves a reservoir at 0.05 m^3/s through a 200-mm riveted steel pipeline that protrudes into the reservoir and then immediately turns a 90º bend with a local (minor) loss coefficient equal to 0.3.

#### The corresponding moment m of the couples

The 30-N uniform rod has length of l=1m. If s=1.5m determine the distance h of placement at the end A along the smooth wall for equilibrium.

#### Determine x the downstream position of the pitot tube

Air at 20oC and 1atm flows at 20 m/s past the flat plate . A pitot tube placed 2mm from the wall, develops a manometer head h=16mm of Meriam red oil (SG = 0.827), measured relative to atmospheric pressure.

#### Determine the probability that a failure is due to disease

Outside factors are related to induced substances (73%) or foreign objects (27%). Natural occurrences are caused by arterial blockage (56%), disease (27%), and infection (e.g., staph infection) (17%). Round your answers to four decimal places (e.g..

#### Calculate what ground distance will be measured

What ground distance will be measured if grid distance is 2158m and Orthometric height = 850m, Scale factor Sf = 0.9999943, Geoidal separation N = 27m, Ra = 6371km

#### Determine the flow discharge in the canal

A trapezoidal canal with a bottom width of 1.5m, a side slope Z=1, has a longitudinal slope of 0.4% and n=0.025. If the water depth in section 1 is 1.52 m and in section

#### Find the angle of rotation of the free end of the shaft

The solid compound shaft, made of three di¤erent materials, carries the two torques shown. (a) Calculate the maximum shear stress in each material. (b) Find the angle of rotation of the free end of the shaft.

#### Determine the cost of capital for the company

a new space age development corporation in wichita kansas has borrowed a sum of \$4M from a friendly bank at an interest rate of 9%. the company has also borrowed another \$1M from other sources at an interest rate of 8%.

#### Which has the larger hydraulic radius and by what percentage

Two pipes, one circular and one square, have the same cross-sectional area. Which has the larger hydraulic radius, and by what percentage

#### Determine the coefficient of kinetic friction

THE 2.5 MG VAN IS TRAVELLING WITH A SPEED OF 100KM/H WHEN THE BRAKES ARE APPLIED AND ALL 4 WHEELS LOCK. IF THE SPEED DECREASES TO 40KM/H IN 5S.

#### What would be the magnitude of the mahor principal stress

A normally consolidated clay soil has angle of friction = 20 degrees and effective stress angle of friction = 28 degrees. If a consolidated undrained test is conducted on this clay with an all around pressure of 21.5 lb/in^2