Design: Weld Joint (bond joint)

The step how to solve the problem of the weld joint (please refer to Shigley's 8th edition book)
1. Get direct shear = Load/ total weld area

2. Find centroid of weld area (see table 9.1 at Chapter 9 page 466)

3. Get torsional shear

- use unit polar area moment of inertia Ju, by setting the weld throat = I
- See table 9.2 at page 470 Ju formula for nine common weld joint

- once you get Ju,
J= te Ju = 0.707 he Ju
- then torsional shear is

4. Vectorially sum direct and torsional shear



To read full note and example please click weld joint

Design: Basic static load exercise with solution

Basic static force vector exercise for going through to another topic inside the Mechanical Components Design. This topic really important because of the basic force vector. This post included 6 question from beginning to advance o the statics analysis.

Please click Question to read the question and click Solution for these problem solving

Design: Bolt Joint (solution chapter 8 Shigley's)

Bolt is one of the method for the joint. This post will cover the selected answer from Shigley's 8th edition problem. The solution of the problem 8.44, 8.48 and 8.49. It's will help you to most understanding for the bolt joint topic. The list below show the step how to solve the bolt joint.

1. Get the direct shear
2. Find centroid
3. Get torsional shear
4. sum vector and find the biggest

click bolt to read/study more about the solution

Design: Gear system (Chapter 13 Shigley's) solution

This chapter address the kinematic relation and forces transmitted by two type of gear: spur, bevel and worm. Gear train is using for power transfers. It using a gear ratio equation.
Forces acting on the spur gear. For the detail of the solution of this topic. I have already done for 13-16, 13-18 and 13-24 so, for the detail solution please click Gear.

Gear system: Toyota vios gear system

Toyota Vios automatic gear system. The output speed (rpm) and Km/h shown in the graph. This data come from the conversion power from the engine bay.

For the full analysis click here!

Design: Shaft Design

The shaft design inside the Shigley's Mechanical Engineering Design cover at Chapter 6.
Shaft design is very important because:

1. Shaft must have adequate torsional strength to

transmit torque and not be over stressed.

2. Shafts are mounted in bearings and transmit power

through devices such as gears, pulleys, cams and

clutches.

3.Components such as gears are mounted on shafts

using keys

4. Shaft must sustain a combination of bending and torsional loads Design Problems

There are 6 step to do how to choose the correct shaft

Step 1: Calculate the torque on the shaft from power

Step 2: Find the torsional stress in the shaft

Step 3: Calculate the loads coming from gears, belts or chains

Step 4: Calculate the bending moment due to the

acting forces. If necessary combine the forces.

Step 5: Calculate the bending stress in the shaft

Step 6: Combine the bending stress and the torsional Stress.

Some example solution from Shigley's 8th Edition exercise question now available to download.

Download Example Solution Now!

Design: Bearing Selection Flow Chart

Bearing are manufactured to take pure radial loads, pure thrust load, or combination load of two kind of loads. This flow chart show the flow how to select bearing depends on load.
Special thanks to M.F. Abdul Hamid Ph.D because teach me how to select bearing from the static loads.

Fatigue Failure: Chapter 5 Shigley's 8th Edition Solution

Failure analysis and prevention are important functions to all of the engineering disciplines. The materials engineer often plays a lead role in the analysis of failures, whether a component or product fails in service or if failure occurs in manufacturing or during production processing. In any case, one must determine the cause of failure to prevent future occurrence, and/or to improve the performance of the device, component or structure.

Easy example: if you have a wire, then the wire you bend with your hand in several time. The wire will fail. this is called the fatigue failure.

for the example of the solution chapter 5 Shigley's is using Max Shear Stress theory (MSST) & Distortion Energy Theory (DET). Please check here! for the solution

Manual gear system: Perodua Myvi (Daihatsu sirion)

The output speed when the engine running at the selection speed of the car. the car speed is evaluated from the engine speed. click here! for the full report.

mechanical engineering design problem solution

This blog is special for undergraduate mechanical engineering student. There are some solution for Machine Design already upload. Just click at the link. These solution will help you to solve the problem in Shigley' s book.

Download E- Solution Now!