Page 79 - 《橡塑技术与装备》英文版2026年3期

MACHINERY AND MOLD

modify their tooling and conduct tests on bidirectional tensile the initially selected steel wire ring model is No. 5, which is
testing machines with a load capacity of over 60T, resulting in 1×6×(11+17+23)×2.2, with a minimum theoretical breaking
significant data errors. There are currently no relevant reports force of 375 kN. Substituting the relevant parameters of the
on specially designed breaking equipment for circular steel steel wire ring into formula (4) for verification, we obtain
wire rings in China. Currently, the calculation of steel wire ring a theoretical breaking force of 404.49 kN, which meets the
breaking force still uses static safety load multiples. design requirements.
To ensure that the supply of steel wire rings meets After the design and selection of the bead wire, the radial
performance requirements, when providing procurement aircraft tire was trial-produced. According to the "Aircraft
standards for steel wire rings, it can be stipulated that Tire Test Method" (GBT9747-2008) and the "Military Aircraft
the strength variation range of products within the same Tire Test Method" (GBJ108B-98), the following tests were
procurement batch should not exceed 200 MPa. Additionally, conducted for verification:
the minimum tensile strength should be specified as follows: (1) Hydraulic burst test
the tensile strength of the core of the steel wire ring should Five aviation tires were selected and subjected to a
not be less than 600 MPa, and the tensile strength of the outer hydraulic burst test using a burst testing machine to verify
wire should not be less than 2100 MPa. The total elongation at whether they meet the performance requirement of having
break for both steel wire materials should not be less than 5%, a burst pressure greater than 4 times the standard internal
and the yield ratio should be greater than 85%. pressure. The measured burst pressures ranged from 4,230
2.3 Model selection verification to 4,650 kPa, which is 4.8 to 5.3 times the standard internal
Taking the design of the steel bead used in a certain pressure of 882 kPa, thus meeting the design requirements. The
specification of military radial aircraft tire as an example, burst locations were all on the tire shoulders, and the bead wire
after being installed on a dedicated rim specified by TRA and remained intact, indicating that the bead wire strength meets
inflated to a rated pressure of 882 kPa, the tire's outer contour the design requirements.
changes from K to K'. The tire's radial outer diameter increases (2) Durability test
from 1,200 mm to 1,235 mm, with a radial expansion rate Using a durability testing machine, we simulated the
of 2.91%, which falls within the range of contour diameter sliding and durability tests of aviation tires. All experimental
expansion rate of 0% to 7.5%. The axial expansion changes data met the standards, with no deformation or damage to the
from 450 mm to 475 mm, with an axial expansion rate of 5.55%, steel wire rings. The performance of the steel wire rings met
which falls within the range of section width expansion rate of the design requirements.
1% to 10%. The section contour area increases by 13.87%. The (3) Dynamic simulation test
area shown in region A' in figure 4 represents the axial cross- The dynamic simulation test method includes: 95 normal
sectional area of the inflated tire. The figure shows a quarter taxi-takeoff tests, 5 overloaded taxi-takeoff tests, 95 normal
of the area, which falls within the range of section tire area landing-taxi tests, 5 overloaded landing-taxi tests; 5 field
growth rate of 8% to 15%. airport taxi-takeoff tests, 5 field airport landing-taxi tests; 1 2.0
The circular steel bead used in radial aircraft tires of this times overloaded high-speed takeoff test, etc.
specification after molding and vulcanization, and the tensile The trial production of aviation tires utilizes the dynamic
force exerted on the steel bead, are calculated using formula (3): simulation test machine from TestingService GmbH (Aachen
T g =P 0 ×(S A ′+S C ) Testing Service GmbH, Germany) to simulate various operational
Using CAD drawing software, the area of S A ′+S C is conditions of tires on the runway. After testing, the results
calculated to be 0.0824 m , and P 0 = 882 kPa. Substituting meet the technical standards issued by C A A C (Civil Aviation
2
these values into the formula, we obtain T g =72.68 kN. Using Administration of China), and also pass the performance testing
formula (5), it is concluded that the breaking force of the requirements of the aviation tire national military standard G J B.
steel wire ring is not less than 363.4 kN. Based on Table 1, Further verification shows that the selection of circular steel wire

Vol.52，2026 ·33·