piston crack标准（英文版）

Issue 2Page 1 of 3 Procedure NumberD 00 N 0040 Issue no2 Issue Date25.02.03 PISTON CRACK TEST Written by :N. LaddhaDate : 28.01.03 Approved by: H. HickDate : 25.02.03 ? : ? D00N0040 Issue 2 Page 2 of 3 ? 1.1 This test is applicable to naturally aspirated and turbo charged Diesel and gasoline engines. 1.2 To test specifically the durability of the piston to cracking caused by a combination of high cycle and low cycle thermal fatigue. In addition cylinder head, exhaust manifold and turbo, which are also susceptible to low and high cycle fatigue failures, are tested. ? 2.1 The test involves a specific cycle with set points at Rated speed (105% load for Diesel engines) and low idle. Slight overload is used to protect for production tolerances. 2.2 The engine is run throughout the test in a fully warm condition. 2.3 This cycle should be run in conjunction with procedure D00 N 0070 which defines the preparation, test and assessment guideline. 2.4 ? StepDuration ( sec) Speed %Load %Condition 10# ?0 ?Ramp from low idle to rated speed 120100105*Rated speed 10100 ?105 ?Ramp from rated speed to low idle 220#0Low Idle #Engine specific value *100 % for gasoline engines D00N0040 Issue 2 Page 3 of 3 ? ? ? ? ? 0 10 20 30 40 50 60 70 80 90 100 110 01020304050607080 ? ? ? ? ? ? ? ? Rated Speed Cycle Length 60 sec Low Idle 0 10 20 30 40 50 60 70 80 90 100 110 120 01020304050607080 ? ? ? ? ? ? ? ? Cycle Step : 21