Project 3: Thermal Fatigue of Solder Interconnects Group#: What happens to an electronic package when it...
Fantastic news! We've Found the answer you've been seeking!
Question:
Transcribed Image Text:
Project 3: Thermal Fatigue of Solder Interconnects Group#: What happens to an electronic package when it is subjected to repeated temperature changes? This question is important if you want your electronic product to be reliable. Every time you use your cell phone, pager, computer, or start your car, the electronics inside begin to warm up. When materials warm up, they expand. However, different materials expand at different rates. For example, the glass-epoxy laminate, called a printed circuit board (PCB), has a coefficient of thermal expansion (CTE) of 12 to 15 x 10-K, while the silicon integrated circuit located inside an electronic package has a CTE equal to 2.5 x 10-"K-1. These differences will induce inelastic deformation to the solder interconnect. The solder interconnect makes the electrical connection from the PCB to the electronic package and is usually made of a low melting- point (183°C) alloy comprised of tin and lead. After using your portable product or computer or turning the car engine off, the electronics will cool off. These temperature cycles result in repeated expansion and contraction of the material used to make the electronic assemblies. The greater the temperature change or the greater the difference in CTE between materials, the greater will be the inelastic strain imparted to the solder joint. A decrease in strain will increase fatigue life. Let's look at a typical situation. Solder Joint Strain, ep Fatigue Cycles, Nf 0.009 10,000 0.031 1000 0.13 100 0.42 10 1.61 1 X Using the experimental fatigue life data given in the table, answer the questions below. Show your work in the provided area when applicable. When you need to graph, use only the graph paper on the back. Choose a linear scale along the axes, and chose a "graph window" appropriate to each graph. Use a ruler to draw the axes and label them clearly. 1. Draw a scatter diagram of the data with solder joint strain as the independent variable. y 2. Let x-In(ep). Show your transformed data and draw a scatter diagram with x as the independent variable and fatigue cycles as the dependent variable. What happens to the shape of the scatter diagram? 3. Let y-In(N). Show your transformed data and draw a scatter diagram with x as the independent variable and y as the dependent variable. What type of relation would best describe the data? 4. Find the line of best fit to the transformed data using a graphing utility. Graph the line of best fit on the scatter diagram drawn in problem 3. Line of best fit: 5. Use the equation from problem 4 to find real numbers r and x to express Nf as a function of rp in the form Nf= r(ep)'. Nf= 6. If the solder joint strain is 0.025, what is the expected fatigue life? Answer: 7. (a) Express the inelastic solder joint strain as a function of the fatigue life by computing the inverse of the function from problem 5. (b) Use it to compute the solder joint strain when the fatigue life equals 3500 cycles. (a) Answer: (b) Answer: Project 3: Thermal Fatigue of Solder Interconnects Group#: What happens to an electronic package when it is subjected to repeated temperature changes? This question is important if you want your electronic product to be reliable. Every time you use your cell phone, pager, computer, or start your car, the electronics inside begin to warm up. When materials warm up, they expand. However, different materials expand at different rates. For example, the glass-epoxy laminate, called a printed circuit board (PCB), has a coefficient of thermal expansion (CTE) of 12 to 15 x 10-K, while the silicon integrated circuit located inside an electronic package has a CTE equal to 2.5 x 10-"K-1. These differences will induce inelastic deformation to the solder interconnect. The solder interconnect makes the electrical connection from the PCB to the electronic package and is usually made of a low melting- point (183°C) alloy comprised of tin and lead. After using your portable product or computer or turning the car engine off, the electronics will cool off. These temperature cycles result in repeated expansion and contraction of the material used to make the electronic assemblies. The greater the temperature change or the greater the difference in CTE between materials, the greater will be the inelastic strain imparted to the solder joint. A decrease in strain will increase fatigue life. Let's look at a typical situation. Solder Joint Strain, ep Fatigue Cycles, Nf 0.009 10,000 0.031 1000 0.13 100 0.42 10 1.61 1 X Using the experimental fatigue life data given in the table, answer the questions below. Show your work in the provided area when applicable. When you need to graph, use only the graph paper on the back. Choose a linear scale along the axes, and chose a "graph window" appropriate to each graph. Use a ruler to draw the axes and label them clearly. 1. Draw a scatter diagram of the data with solder joint strain as the independent variable. y 2. Let x-In(ep). Show your transformed data and draw a scatter diagram with x as the independent variable and fatigue cycles as the dependent variable. What happens to the shape of the scatter diagram? 3. Let y-In(N). Show your transformed data and draw a scatter diagram with x as the independent variable and y as the dependent variable. What type of relation would best describe the data? 4. Find the line of best fit to the transformed data using a graphing utility. Graph the line of best fit on the scatter diagram drawn in problem 3. Line of best fit: 5. Use the equation from problem 4 to find real numbers r and x to express Nf as a function of rp in the form Nf= r(ep)'. Nf= 6. If the solder joint strain is 0.025, what is the expected fatigue life? Answer: 7. (a) Express the inelastic solder joint strain as a function of the fatigue life by computing the inverse of the function from problem 5. (b) Use it to compute the solder joint strain when the fatigue life equals 3500 cycles. (a) Answer: (b) Answer:
Expert Answer:
Answer rating: 100% (QA)
1 Scatter Dagram with solder strain as independent variable solder joint Strain ep w... View the full answer
Related Book For
Applied Statistics and Probability for Engineers
ISBN: 978-1118539712
6th edition
Authors: Douglas C. Montgomery, George C. Runger
Posted Date:
Students also viewed these physics questions
-
Chromalox Instruments and Controls, located in LaVergne, Tennessee, is a manufacturer of industrial process controllers, monitors, and industrial and military control panels. Chromalox products are...
-
Planning is one of the most important management functions in any business. A front office managers first step in planning should involve determine the departments goals. Planning also includes...
-
Managing Scope Changes Case Study Scope changes on a project can occur regardless of how well the project is planned or executed. Scope changes can be the result of something that was omitted during...
-
A ball of mass 0.440 kg moving east( + x direction) with a speed of 3.30m/s collides head-on with a 0.220-kg ball at rest. If the collision is perfectly elastic, what will be the speed and direction...
-
Harvey Corporation produces several joint products from common materials and shared production processes. Why are costs incurred up to the split-off point not relevant in deciding which products...
-
A university published the following distribution of students enrolled in the various colleges: Construct a bar chart of these data. College Enrollment College Enrollment Agriculture 1250 Liberal...
-
An A-36 steel column has a length of \(4 \mathrm{~m}\) and is pinned at both ends. If the cross-sectional area has the dimensions shown, determine the critical load. -25 mm 25 mm- 10 mm 25 mm 10 mm...
-
Aamodt Music sold CDs to retailers and recorded sales revenue of $700,000. During 2010, retailers returned CDs to Aamodt and were granted credit of $78,000. Past experience indicates that the normal...
-
The stockholders' equity section of TVX Company on February 4 follows. Common stock-$10 par value, 150,000 shares authorized, 61,000 shares issued and outstanding Paid-in capital in excess of par...
-
A commercial real estate investment fund must report its quarterly investment performance to investors. A summary of its (1) beginning and end-of-quarter assets and equity and (2) cash inflows and...
-
A company has a probable loss that can only be reasonably estimated within a range of outcomes. No single amount within the range is a better estimate than any other amount. Under U.S. GAAP, what...
-
A \(27-\mathrm{kg}\) child stands in the center of a trampoline. (a) If the trampoline center is \(0.32 \mathrm{~m}\) lower than before they got on, what is the spring constant of the trampoline? (b)...
-
Describe the various ways in which the courts become involved with separation agreements.
-
An 80-kg man rides in an elevator from the ground to an upper floor. The elevator goes from rest to \(10 \mathrm{~m} / \mathrm{s}\) in 5 seconds, and then continues at the same constant speed for 10...
-
Describe how the courts historically viewed separation agreements and why.
-
You throw a \(100-\mathrm{g}\) ball upward with a speed of \(19.8 \mathrm{~m} / \mathrm{s}\). How much work does the force of gravity do on the ball during its trip to its maximum height?
-
F Y V High-Low Method, Cost Formulas The controller of the South Charleston plant of Ravinia, Inc., monitored activities associated with materials handling costs. The high and low levels of resource...
-
Access the Federation of Tax Administrators Internet site at www. taxadmin.org/state-tax-forms and indicate the titles of the following state tax forms and publications: a. Minnesota Form M-100 b....
-
Assume that each of your calls to a popular radio station has a probability of 0.02 of connecting, that is, of not obtaining a busy signal. Assume that your calls are independent. (a) What is the...
-
Construct a histogram for the female student height data in Exercise 6-38. Data from 6-38 62 64 61 67 65 68 61 65 60 65 64 63 59 65 67 62 66 68 67 66 65 67 65 68 64 66 68 69 69 65 69 65 67 67 65 63 4...
-
The January 1990 issue of Arizona Trend contains a supplement describing the 12 best golf courses in the state. The yardages (lengths) of these courses are as follows: 6981, 7099, 6930, 6992, 7518,...
-
Dry, compressed air at \(T_{m, i}=75^{\circ} \mathrm{C}, p=10 \mathrm{~atm}\), with a mass flow rate of \(\dot{m}=0.001 \mathrm{~kg} / \mathrm{s}\), enters a \(30-\mathrm{mm}-\) diameter, 5 -m-long...
-
Heated air required for a food-drying process is generated by passing ambient air at \(20^{\circ} \mathrm{C}\) through long, circular tubes \((D=50 \mathrm{~mm}, L=5 \mathrm{~m}\) ) housed in a steam...
-
Liquid mercury at \(0.25 \mathrm{~kg} / \mathrm{s}\) is to be heated from 325 to \(375 \mathrm{~K}\) by passing it through a \(25-\mathrm{mm}\)-diameter tube whose surface is maintained at \(400...
Study smarter with the SolutionInn App