Rim Plastic Deformation Test: Ensuring Durability and Performance

Plastic deformation is a critical factor in evaluating the durability of carbon rims. Unlike the standard vertical stiffness test, which measures immediate deflection under load, plastic deformation assesses how much permanent deflection occurs after sustained pressure. This test is essential for ensuring that carbon rims can handle real-world riding conditions without compromising their structural integrity.

Test Standard

At our factory, we have established rigorous internal standards for carbon rim plastic deformation. Specifically, our rims must exhibit no more than 1mm of permanent deformation after a 2-minute high-load compression test. For consistency, the rim is tested in the valve hole-up position.

Test Equipment

To accurately measure plastic deformation, we rely on a Universal Testing Machine (UTM). This high-precision equipment features a robust base and a secure clamping system that holds the rim in place during testing. Above the rim, a compression fixture applies a gradually increasing load (up to 70kgf), while a sensor records the resulting deformation. All data is captured and analyzed on a computer for in-depth assessment.

Moving Speed	Test Spots	Max Applied Force	Test Side
0.4m/s	Valve hole side up	70kgf	Double-side compression

Test Method

Step 1: Secure the rim - The rim is carefully mounted onto the testing apparatus with the valve hole side facing up. This ensures that the rim remains stable throughout the test.

Step 2: Apply compression - The compression fixture is lowered to contact the rim at the designated test point. The machine then gradually applies force at a controlled speed of 0.4 m/s, increasing up to a maximum of 70kgf. The load is maintained for 2 minutes to assess how the rim responds under sustained pressure..

Step 3: Record deformation - During the load application, the fixture monitors and records any deformation of the rim. This data is continuously synced to a computer system for further analysis, enabling us to evaluate the rim’s structural resilience and overall performance.

Sample Test Report

Example Profile

Model	Size	Width	Depth	Weight (Stated)	Measured Weight
EN32-23	29" (622-32)	32/39mm	23mm	460g	455g

Test Result

Force Applied	Test duration	Max Deformation
70kgf (max for duration)	2 minutes	0.35mm

As illustrated in this test, the rim shows minimal deformation, confirming its high level of durability under heavy load conditions.

The plastic deformation test is an essential step in the production process of our carbon rims. It ensures that each rim can withstand high forces without experiencing excessive permanent deformation, maintaining its performance and safety standards. With a stringent maximum deformation limit of 1mm, our rims are engineered to offer superior strength and longevity, providing cyclists with reliable, high-performance wheels for a variety of riding conditions.

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Email: koko@ntpcomposites.com
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NexusTech Prime (NTP) Composites

Established in 2013 initially as an OEM carbon rim contract manuafacturer, NTP composites has grown steadily to be a full-service OEM and ODM service provider, with brilliant quality control, proficient engineering capability, and excellent customer service.

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