How to test the service life of circular hole needle arrangement

The application life of circular hole needle arrangement is the first policy to measure the reliability of circular hole needle arrangement function. With the increasing solicitation of electronic products' fault-free working function, the application life of circular hole needle arrangement scheme has become a scheme guide. In addition, the aggravation of market competition also implores program personnel to find suitable materials in non-precious alloys to reduce the cost of circular hole needle. In many cases, the inductive effect of these trends brings the working characteristics of copper alloys with circular holes and needles closer to their functional limits.

The initial contact force is a primary element of the circular hole stitching scheme and material properties. Since the elastic deformation is converted into plastic deformation in the contact member, the stress release will result in the reduction of the contact force. If the contact force is lower than a certain critical level, the function of the contact will fail. Therefore, the assumption that stress release as a function of time and temperature naturally becomes the key factor to ensure the reliability of circular hole needle arrangement. The following holon electronics on the specific introduction of stress release test conjecture circular hole needle use life of the question.

The stress release data is a useful tool for planners to guess the lifespan of electronic circular hole pins and enable them to make choices about contact materials based on available data. These data are now widely used in the accounting, communications and automotive electronics industries. Today, however, there is very little data on the life cycle of products, especially in the field of accounting machines. Not only that, but it's a much more useful piece of data to shorten the product development cycle and useful life.

Most of the hole stitch program personnel select the stress release data primarily in order to reduce the contact material selection plan according to the application request. However, many planners are also looking for appropriate testing methods to better guess the characteristics of the circular hole needle application life. This greatly reduces the number of samples required for testing and the cost associated with testing many samples.

Nowadays, harsh environment and engine hood inside the car circular hole needle mostly choose 3 or 1 program technology entreaty; And the next generation of automobile circular hole needle working temperature estimation will progress to. It is just that most non-automotive round hole stitching does not need to adhere to its stability under the above conditions. However, the initial insertion force of high-density circular hole needle arrangement is lower, which in turn reduces the stress release. This makes stress release a primary property even at lower temperatures.

The standard timekeeping required for test data associated with a particular application is often difficult to determine accurately. At the desired operating temperature, the inspection time between 1000h and 3000h can be used to evaluate the characteristic data of automotive electronics. There are signs that we are paying more and more attention to characteristic data beyond 3000h, that is, 3000h to 5000h(the equivalent of 150000 miles of operational life). The calculation of the test data (without considering the change of slope) may lead to an overestimation of the lifespan of the contact piece, and the overestimation will increase correspondingly with the extension of time. The semilog graphic representation of data at a given temperature is now the most widely used and requires the most fire. This is also the most concise way to compare the various materials used in a particular application. It is important to note, however, that the accounting data should be carefully examined, with a view to the possibility of an overestimate of longevity after all.

The following conclusions were drawn from the stress release test:

(1) The elements that push the working function of the circular hole needle closer to the limit of the alloy's function will probably continue to exist. This indicates that the key of circular hole pin arrangement is to guess stress release accurately.

(2) When the stress is used as a function of the test time, changes in the slope are often found. Therefore, the inspection time should be appropriately long to capture this feature.

(3) When the measured data has a certain correlation with the temperature, it is very useful to linearly extend the existing data to a longer inspection time. What is lacking is that, when the test time is out of date, it is sometimes slanted and its function cannot be guessed at other temperatures.

(4) In a single diagram, the Larson-Miller parameter is very useful in creating data curves at various temperatures. This method is also extremely useful for guessing the function of a material between the temperatures at which it has been completed and the temperatures at which it has been tested for a short period of time, and thus imitating the function of the material over a long period of time. However, assuming that the test temperature plan is exceeded, it cannot be used for accounting purposes.

(5) The two methods can be combined to recheck the accounting value.

(6) The rolling of copper strip can imitate the manufacturing of circular hole row needle, and its effect is opposite to that of C7025 and C17410.

(7) There are some limitations in the data obtained from the strip. Since the bending was finished in the manufacturing process of the circular hole needle row, it did not reflect any negative effects.